Samsung firmwares, SM-G991U1 (ATT) | EN

Download the latest Samsung firmware ✅ SM-G991U1 ATT. Full list of firmwares available for download

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Samsung firmware list
DeviceModelRegionPDA/AP VersionCSC VersionMODEM/CP VersionOs VersionBuild Date
Samsung Galaxy S21 5GSM-G991U1ATTG991U1UESAFXBCG991U1OYMAFXBCG991U1UESAFXBC14
Samsung Galaxy S21 5GSM-G991U1ATT G991U1UESAFXAB G991U1OYMAFXABG991U1UESAFXAB14
Samsung Galaxy S21 5GSM-G991U1ATT G991U1UES9FXA1 G991U1OYM9FXA1G991U1UES9FXA114
Samsung Galaxy S21 5GSM-G991U1ATT

SM-G991U1ATTG991U1UEU9FWL3

One UI 6.0 Upgrade

Quick panel

New button layout
The quick panel has a new layout that makes it easier to access the features you use most. Wi-Fi and Bluetooth now have their own dedicated buttons at the top of the screen, while visual features, like Dark mode and Eye comfort shield have been moved to the bottom. Other quick settings buttons appear in a customizable area in the middle.

Instantly access the full quick panel
By default, a compact quick panel with notifications appears when you swipe down from the top of the screen. Swiping down again hides notifications and shows the expanded quick panel. If you turn on Quick settings instant access, you can view the expanded quick panel by swiping just once from the right side of the top of the screen. Swiping down from the left side shows notifications.

Quickly access brightness control
The brightness control bar now appears by default in the compact quick panel wh...
G991U1OYM9FWL3G991U1UEU9FWL314
Samsung Galaxy S21 5GSM-G991U1ATT G991U1UEU9EWL2 G991U1OYM9EWL2G991U1UEU9EWL213
Samsung Galaxy S21 5GSM-G991U1ATT G991U1UES9EWK1 G991U1OYM9EWK1G991U1UES9EWK113
Samsung Galaxy S21 5GSM-G991U1ATT G991U1UES9EWI3 G991U1OYM9EWI3G991U1UES9EWI313
Samsung Galaxy S21 5GSM-G991U1ATT

SM-G991U1ATTG991U1UEU9EWI2

• Stability and reliability
Device behavior has been improved.
• Security
The device is protected with improved security.
G991U1OYM9EWI2G991U1UEU9EWI213
Samsung Galaxy S21 5GSM-G991U1ATT G991U1UES9EWI1 G991U1OYM9EWI1G991U1UES9EWI113
Samsung Galaxy S21 5GSM-G991U1ATT G991U1UES8EWG3 G991U1OYM8EWG3G991U1UES8EWG313

Changelog: SM-G991U1(ATT)

• Security
The device is protected with improved security.

• Security
The device is protected with improved security.

One UI 6.0 Upgrade



Quick panel

New button layout
The quick panel has a new layout that makes it easier to access the features you use most. Wi-Fi and Bluetooth now have their own dedicated buttons at the top of the screen, while visual features, like Dark mode and Eye comfort shield have been moved to the bottom. Other quick settings buttons appear in a customizable area in the middle.

Instantly access the full quick panel
By default, a compact quick panel with notifications appears when you swipe down from the top of the screen. Swiping down again hides notifications and shows the expanded quick panel. If you turn on Quick settings instant access, you can view the expanded quick panel by swiping just once from the right side of the top of the screen. Swiping down from the left side shows notifications.

Quickly access brightness control
The brightness control bar now appears by default in the compact quick panel when you swipe down once from the top of the screen for quicker and easier brightness adjustments.

Improved album art display
While playing music or videos, album art will cover the entire media controller in the notification panel if the app playing the music or video provides album art.

Enhanced layout for notifications
Each notification now appears as a separate card, making it easier to recognize individual notifications.

More vivid notification icons
You can use the same full-color icons that are used for each app on the Home and Apps screens. You can turn this on in Settings.

Sort notifications by time
You can now change your notification settings to sort by time instead of priority so your newest notifications are always on top.



Lock screen

Reposition your clock
You now have more freedom to move your clock to the position of your choice on the Lock screen.



Home screen

Simplified icon labels
App icon labels are now limited to a single line for a cleaner and simpler look. "Galaxy" and "Samsung" have been removed from some app names to make them shorter and easier to scan.

Drag and drop with 2 hands
Start dragging app icons or widgets on your Home screen with one hand, then use your other hand to navigate to the screen where you want to drop them.



Multitasking

Keep pop-up windows open
Instead of minimizing pop-up windows when you go to the Recents screen, pop-ups will now remain open after you leave the Recents screen so you can continue what you were working on.



Samsung Keyboard

New emoji design
Emojis that appear in your messages, social media posts, and elsewhere on your phone have been updated with a fresh new design.



Content sharing

Picture previews
When you share pictures from any app, preview images will appear at the top of the Share panel to give you one more chance to review the pictures before sharing them.



Weather

New Weather widget
The Weather insights widget provides more information about your local weather conditions. You can see when severe thunderstorms, snow, rain, and other events are on the forecast.

More information in Weather app
Information about snowfall, moon phases and times, atmospheric pressure, visibility distance, dew point, and wind direction is now available in the Weather app.

Interactive map view
Swipe to move around the map and tap a location to view the local weather conditions. The map can help you find weather information even if you don’t know the name of the city.

Enhanced illustrations
Illustrations in the Weather widget and app have been enhanced to provide better information about the current weather conditions. Background colors also change depending on the time of the day.



Camera

Simple and intuitive design
The overall layout of the Camera app has been simplified. Quick settings buttons on the preview screen have been redesigned to be easier to understand.

Custom camera widgets
You can add custom camera widgets to your Home screen. You can set each widget to start in a specific shooting mode and save pictures in an album of your choice.

More alignment options for watermarks
You can now choose whether your watermark appears at the top or bottom of your photos.

Scan documents easily
The Scan document feature has been separated from Scene optimizer so you can scan documents even if Scene optimizer is turned off. The new Auto scan lets you scan documents automatically whenever you take a picture of a document. After a document is scanned, you’ll be taken to the edit screen where you can rotate your document to align it the way you want.

Quick access to resolution settings
A resolution button is now available in the quick settings at the top of the screen in Photo and Pro modes so you can quickly change the resolution of photos you take.

Easier video size options
A pop-up now appears when you tap the video size button, making it easier to see all the options and choose the right ones.

Keep your pictures level
When grid lines are turned on in Camera settings, a level line will now appear in the middle of the screen while using the rear camera in all modes except Panorama. The line will move to show whether your picture is level with the ground.

Quality optimization
You can choose between 3 levels of quality optimization for the pictures you take. Choose Maximum to get the highest quality pictures. Choose Minimum to take pictures as quickly as possible. You can also choose Medium to get the best balance of speed and quality.

Turn off swipe up/down to switch cameras
Swiping up or down to switch between the front and rear cameras is now optional. If you’re concerned about accidental swipes, you can turn this off in Settings.

Apply effects more easily
Filter and face effects now use a dial instead of a slider making it easier to make precise adjustments with just one hand.



Gallery

Quick edits in detail view
While viewing a picture or video, swipe up from the bottom of the screen to go to detail view. This screen now provides quick access to effects and editing features you can immediately apply.

Drag and drop with 2 hands
Touch and hold pictures and videos with one hand, then use your other hand to navigate to the album where you want to drop them.

Save clipped images as stickers
When you clip something from an image, you can easily save it as a sticker that you can use later when editing pictures or videos.

Enhanced story view
While viewing a story, a thumbnail view appears when you swipe up from the bottom of the screen. In thumbnail view, you can add or remove pictures and videos from your story.



Photo Editor

Enhanced layout
The new Tools menu makes it easier to find the editing features you need. Straighten and Perspective options have been combined in the Transform menu.

Adjust decorations after saving
You can now make changes to drawings, stickers, and text that you've added to a photo even after saving.

Undo and redo
Don't worry about making mistakes. You can now easily undo or redo transformations, filters, and tones.

Draw on custom stickers
When creating custom stickers, you can now use the drawing tools to make your stickers even more personal and unique.

New text backgrounds and styles
When adding text to a photo, you can choose from several new backgrounds and styles to help you get the perfect look.



Studio (Video Editor)

More powerful video editing
Studio is a new project-based video editor, allowing for more complex and powerful editing. You can access Studio from the Drawer menu in Gallery or add an icon to your Home screen for quicker access.

Timeline layout
Studio lets you view your entire project as a timeline containing multiple video clips. The multi-layered structure lets you add clips, stickers, subtitles, and other objects and adjust their position and length easily.

Save and edit projects
You can also save unfinished movie projects to continue editing them later.



Video Player

Enhanced layout
Video player controls are now easier than ever. Buttons with similar functions have been grouped together, and the Play button has been moved to the center of the screen.

Enhanced playback speed controls
Choose between several video playback speeds between 0.25x and 2.0x. Speed controls are now easier to access with dedicated buttons instead of a slider.



Samsung Health

New look for the Home screen
The Samsung Health Home screen has been completely revamped. More information is shown, while bold fonts and colors make it easier to see the information you need most. Your latest exercise result is shown at the top of the screen, and more feedback is provided about your sleep score as well as your daily goals for steps, activity, water, and food.

Custom water cup sizes
You can now customize the size of cups in the Samsung Health Water tracker to match the size of the cup you usually drink from.



Calendar

Your schedule at a glance
The new schedule view provides your upcoming events, tasks, and reminders all together in chronological order.

View your reminders in Calendar
You can now view and add reminders in the Calendar app without opening the Reminder app.

Move events with 2 hands
In Day or Week view, touch and hold the event you want to move with one hand, then use your other hand to navigate to the day where you want to move it.



Reminder

Refined reminder list view
The main list view has been redesigned. You can manage categories at the top of the screen. Below the categories, your reminders will be shown organized by date. The layout for reminders containing images and web links has also been enhanced.

New reminder categories
The Place category contains reminders that alert you when you're in a specific place, and the No alert category contains reminders that don't provide any alerts.

More options for creating reminders
When sharing content to the Reminder app, you'll get full editing options before your reminder is created. You can also take pictures using the camera when creating a reminder.

Create all-day reminders
You can now create reminders for an entire day and customize the time you want to be alerted about them.



Samsung Internet

Play videos in the background
Keep playing video sound even if you leave the current tab or leave the Internet app.

Enhanced tab list view for large screens
When using Internet on a large screen, such as a tablet in landscape view or Samsung DeX, tab list view will be shown in 2 columns so you can see more information on the screen at the same time.

Move bookmarks and tabs with 2 hands
Touch and hold the bookmark or tab you want to move with one hand, then use your other hand to navigate to the bookmark folder or tab group where you want to move it.



Smart select

Resize and extract text from pinned content
When you pin an image to the screen, you can now resize it or extract text from it.

Magnified view
When selecting an area of the screen, a magnified view will appear so you can start and end your selection at the perfect spot.



Bixby text call

Switch to Bixby during a call
You can switch to Bixby text call at any time, even if the call is already in progress.



Modes and Routines

Change the appearance of your Lock screen
Set up different Lock screens with their own wallpaper and clock style for when you're driving, working, exercising, and more. Try a dark wallpaper for Sleep mode or a calming wallpaper for Relax mode. When you edit the Lock screen for a mode, you’ll see that wallpaper whenever that mode is turned on.

New conditions
You can now start a routine when an app is playing media.

New actions
Your routines can now do more than ever before, such as changing your Samsung Keyboard settings.



Smart suggestions

New look and feel
The Smart suggestions widget has been redesigned with a layout that better aligns with other icons on your Home screen.

More customization
You can now adjust transparency and choose between a white or black background. You can also set apps to exclude from suggestions.



Finder

Quick actions for apps
When an app appears in your search results, you can touch and hold the app to get quick access to actions you can perform using the app. For example, if you search for the Calendar app, buttons for adding an event or searching your calendar will appear. App actions will also appear in search results on their own if you search for the name of the action instead of the app.



My Files

Free up storage space
Recommendation cards will appear to help you free up storage space. My Files will recommend deleting unnecessary files, give you tips for setting up cloud storage, and also let you know which apps on your phone are using the most storage space.

Integrated Trash with Gallery and Voice Recorder
My Files, Gallery, and Voice Recorder Trash features have been combined into one. When you open the Trash in My Files, you’ll be able to see files, pictures, videos, and voice recordings you’ve deleted all together, along with options for restoring or permanently deleting.

Copy files with 2 hands
Touch and hold the file you want to copy with one hand, then use your other hand to navigate to the folder where you want to copy it.



Samsung Pass

Safer sign-ins with passkeys
Use passkeys to sign in to supported apps and websites. Unlike passwords, your passkey is only stored on your phone and can't be leaked through a website security breach. Passkeys also protect you from phishing attacks because they only work on the website or app where they were registered.



Settings

Smarter Airplane mode
If you turn on Wi-Fi or Bluetooth while Airplane mode is on, your phone will remember. The next time you use Airplane mode, Wi-Fi or Bluetooth will remain on instead of turning off.

Easier access to battery settings
Battery settings now have their own top-level settings menu so you can easily check your battery usage and manage battery settings.

Block security threats
Get an extra level of protection for your apps and data. Auto Blocker prevents unknown apps from being installed, checks for malware, and blocks malicious commands from being sent to your phone using a USB cable



Accessibility

Vision enhancements easier to find
The Spoken assistance and Visibility enhancements menus have been combined into one Vision enhancements menu for quicker, simpler access.

New magnification options
Customize how your magnification window appears. You can choose full screen, partial screen, or allow switching between the two.

Customize cursor thickness
You can now increase the thickness of the cursor that appears while editing text so that it's easier to see.

Learn more about accessibility
A link to the Samsung Accessibility web page has been added to Accessibility settings so you can learn more about accessibility features and our efforts to make our products accessible to everyone.



Digital Wellbeing

Enhanced layout
The main screen of Digital Wellbeing has been redesigned, making it easier to find the information you need.

More content in your weekly report
Your weekly usage report now lets you know about unusual usage patterns, your peak usage times, and how you balance your screen time.

• Security
The device is protected with improved security.

• Security
The device is protected with improved security.

• The security of your device has been improved.

• Stability and reliability
Device behavior has been improved.
• Security
The device is protected with improved security.

• The security of your device has been improved.

• The security of your device has been improved.

• The security of your device has been improved.

Software and Terms & Conditions Update

IMPORTANT INFORMATION: This update includes revised Terms & Conditions for your device, including the Dispute Resolution Agreement with arbitration terms. For more information, review https://www.samsung.com/us/support/legal/mobile/.
​By clicking “Install now,” by scheduling your install, or by continuing to use your device after installation, you agree to these revised Terms & Conditions.

• Security
The device is protected with improved security.

· The security of your device has been improved.

· The security of your device has been improved.

• The security of your device has been improved.

· The security of your device has been improved.

· Device stability improvements, bug fixes.
· New and / or enhanced features.
· Further improvements to performance.

One UI 5.1 Update

One UI 5.1 takes your phone to the next level with new Gallery features as well as productivity and personalization enhancements.



Camera and Gallery

Quickly change the color tone for selfies
It's easier to change the color tone of your selfies using the Effects button at the top of the screen.

More powerful search
You can now search your Gallery for more than one person or subject at the same time. You can even search for people without tagging their names just by tapping their faces.

Enhanced image remastering
Remastering does more to make your pictures look great by removing shadows and reflections. You can also remaster GIFs for better resolution and clarity. Preview has also been improved to make it easier to compare the original picture with the remaster.

Create a shared family album
It’s easier than ever to share pictures with your family. Gallery will recommend pictures to add to your shared family album by recognizing the faces of family members you select. You get 5 GB of storage for each family member (up to 6 people).

Revamped info display
When you swipe up while viewing a picture or video in your Gallery, you can see when and where the picture was taken, which device took the picture, where the picture is stored, and more. Now with a simpler layout.



Multitasking

Easily minimize or switch to full screen
You can now minimize or maximize an app window without going to the options menu. Just drag one of the corners.

Access your most used apps in split screen
When you start a split-screen view, the apps you use most often will be shown below your recently used apps to help you find the apps you need faster.

Improved multitasking in DeX
In split-screen view, you can now drag the divider in the center of the screen to resize both windows. You can also snap a window to one of the corners to make it fill a quarter of the screen.



Modes and Routines

Change wallpapers based on your mode
Set a different wallpaper based on your current activity. Choose one wallpaper for work, one for exercising, and more.

More actions for routines
New actions let you control Quick Share and Touch sensitivity, change your ringtone, and change your font style.



Weather

Quick access to useful information
Check severe weather alerts, daily weather summaries, and sunrise/sunset times at the top of the Weather app. The temperature graph now uses colors to show how the temperature changes throughout the day.

Hourly precipitation graph
An hourly graph now shows how much precipitation has fallen at different times of the day.

Summary on Weather widget
A brief summary of the current weather conditions now appears on the weather widget to let you know if it's sunny, cloudy, raining, or snowing.



Samsung Internet

Continue browsing on another device
If you're browsing the web on one Galaxy phone or tablet and later open the Internet app on another Galaxy device signed in to the same Samsung account, a button will appear that lets you open the last webpage you were viewing on the other device.

Improved search
Your searches now include the names of bookmark folders and tab groups. Improved search logic lets you find what you're looking for even if something isn't spelled correctly.



Additional changes

Let Bixby take your calls
Use Bixby text call to answer calls automatically and find out why the person is calling. You'll see what the caller says in a text chat, and you can tap or type responses that will be read aloud to the caller. Bixby text call is only available in English and Korean.

Check the battery level of your devices
The new Battery widget lets you check the battery level of your devices, right from the Home screen. You can see how much battery is left on your phone, Galaxy Buds, Galaxy Watch, and other supported devices.

Use up to 3 emojis in AR Emoji Camera
Take fun pictures and videos with your friends in Mask mode. You can assign a different emoji to each person’s face.

Settings suggestions
While signed in to your Samsung account, suggestions will appear at the top of the Settings screen to help you share, connect, and enhance your experience across your Galaxy devices.

Spotify suggestions
The Smart suggestions widget now recommends Spotify tracks and playlists based on your current activity. Get the perfect tunes for driving, exercising, and more. To get suggestions, you need to sign in to a Spotify account in the latest version of the Spotify app.

Choose where to save screenshots and screen recordings
You can now change the folder where screenshots and screen recordings are saved.

• The security of your device has been improved.

· The security of your device has been improved.

· The security of your device has been improved.

• The security of your device has been improved.

· The security of your device has been improved.

· The security of your device has been improved.

• Overall stability of your device has been improved.
• The security of your device has been improved.

• Overall stability of your device has been improved.
• The security of your device has been improved.

• Overall stability of your device has been improved.
• The security of your device has been improved.

· The security of your device has been improved.

• Overall stability of your device has been improved.
• The security of your device has been improved.

• Overall stability of your device has been improved.
• The security of your device has been improved.
• Camera
- The Night portrait feature has been enhanced.
- The quality of pictures taken with social or camera apps downloaded from the application store has been improved.
- The 'Auto framing' feature is supported in video mode and some video call apps.

· The security of your device has been improved.

One UI 4.1 Update
One UI 4.1 brings you the latest features for your Galaxy devices. More intuitive, more fun, more secure, and easier than ever.
Check out the changes below.

Camera
It's easier than ever to capture great photos and videos.
More options for portrait videos
Capture great portrait videos even when your subject is far away. You can now record portrait videos with the 2x lens on the rear camera in addition to the 1x lens.
Enhanced night portraits
Take stunning portraits, even in low light. Night shots are now supported in Portrait mode.
Get the full director’s view
You can save your director’s view videos with separate front and rear videos so you can edit them later, even after you’re done recording. When you play them back in the Video player, you can switch between different views such as split-screen or picture-in-picture.

Gallery
Do more with your memories. Gallery brings enhanced features for remastering and organizing your pictures and videos, and sharing is now easier than ever.
Powerful remastering
Make your photos look better than ever. Sharpen blurry faces, fix distortion on TVs or computer screens, and increase brightness and resolution.
More suggestions
Get help creating artistic portraits and exciting highlight reels. Gallery will suggest the best effects for your pictures.
Add portrait effects
You can now add background blur to any picture with a person in view.
Portrait relighting
Adjust the lighting for portraits, even after you've taken them, to make sure you always get the perfect shot.
Convert unnecessary motion photos to still images
Save storage space by converting motion photos to still images. Gallery will suggest pictures where motion isn't necessary, such as documents.
Share albums as links
No need to invite people to shared albums individually anymore. Just create a link that can be shared with anyone, even if they don't have a Samsung account or Galaxy device.
All your invitations together
Easily accept invitations to shared albums, even if you miss the notifications. Invitations that you haven't responded to yet will appear at the top of your shared album list.
Create time lapse videos
Turn a picture into a vivid 24-hour time-lapse video. A button will appear for pictures of scenery including the sky, bodies of water, mountains, or cities. Your video will appear as if an entire day has passed.

AR Zone
Express yourself like never before in augmented reality. Create your own emojis, stickers, doodles, and more.
More decorations for your emoji stickers
Show your own unique style by adding GIFs from Tenor as decorations for your custom AR emoji stickers.
Add more to your AR doodles
Create 3D stickers by scanning real-world objects, then add them to your AR doodle. You can also add GIFs from Tenor and Giphy.
Background colors in mask mode
Keep the focus on your AR emoji while wearing it as a mask. Choose from a variety of colors to use as your background.

Smart Widget
Your Home screen widgets just got smarter. Just choose the widgets you want and let your Galaxy do the rest.
Group widgets together
Save space on your Home screen by combining multiple widgets into one Smart Widget. Swipe left or right to scroll through your widgets, or set them to rotate automatically to show you the most relevant information based on your activity.
Get suggestions on your Home screen
Your Smart Widget will tell you when it's time to charge your Galaxy Buds, when it's time to get ready for an event on your calendar, and more.

Google Duo
Stay in touch with high-quality video calls. One UI brings you exclusive features.
Do more during video calls
You can share another app's screen during a video call in Google Duo. Watch YouTube together, share photos, explore maps, and more.
Join video calls in presentation mode
During a video call on your phone, you can join the same call on your tablet in presentation mode. Your tablet's screen will be shared with other participants while audio and video continue on your phone.

Samsung Health
Get deeper insights into your health and enhanced exercise tracking in the latest version of Samsung Health.
Get insights about your body composition
Set targets for your weight, body fat percentage, and skeletal muscle mass. You'll get tips for reaching your goals.
Build better sleep habits
Track your sleep and get coaching based on your sleep patterns.
Enhanced exercise tracking
On your Galaxy Watch4, you can set interval training targets before you start running or cycling. You'll get a report on your phone when you're finished. Your watch can also give information about sweat loss when you run and heart rate recovery for aerobic workouts.

Smart Switch
Transfer contacts, photos, messages, and settings from an old phone or tablet to your new Galaxy. One UI 4.1 lets you transfer more than ever.
More transfer options
You’ll get 3 options when transferring content to your new Galaxy. You can choose to transfer everything, transfer just your accounts, contacts, calls, and messages, or go Custom to choose exactly what you want to transfer.

SmartThings Find
Find your phone, tablet, watch, earbuds, and more with SmartThings Find.
Get notified when you leave something behind
Make lost belongings a thing of the past. You can choose to get alerts whenever your Galaxy SmartTag is too far away to connect to your phone.
Find a lost device together
You can share the location of your devices with others. If a device gets lost, you can get help from another person to scan for it nearby.

Sharing
One UI 4.1 gives you even more ways to share with others.
Share your Wi-Fi network
Use Quick Share to share your current Wi-Fi network with someone else. The person you share with will be able to connect automatically without entering the password.
Include editing history when you share pictures and videos
When you share pictures and videos with Quick Share, you can include the complete editing history so the receiver can see what's changed or revert back to the original.
Share tips with others
Find something useful in the Tips app? Tap the Share icon to send it to a friend.

More features and improvements
Color palette
Customize your phone with unique colors based on your wallpaper. Your custom color palette now appears in more apps, including apps provided by Google.
Smart suggestions
Your Galaxy just got a lot smarter. When you start adding an event to your calendar, your device will suggest a title and time based on text messages and other activity on your phone. You'll get similar suggestions in Calendar, Reminder, Keyboard, Messages, and other apps.
Clean up shadows and reflections in Photo Editor
Shadows and reflections will be removed automatically whenever you use the Object eraser.
Add emojis to your calendar
In addition to stickers, you can now add emojis to a date on your calendar to express your feelings.
Take quick notes while you browse
Keep track of your sources with new clipping options for Samsung Notes. You can include content from Samsung Internet or Gallery when you create a note using the quick panel or the Tasks edge panel.
Choose apps for text correction in Samsung Keyboard
Choose which apps you want to get automatic text corrections in. Turn it on for writing apps to keep your spelling and grammar in check, and turn it off for texting apps where you want to be less formal.
More widely available keyboard options
Keyboard layouts, input methods, and features for specific languages are now available in more regions, so you can type easily no matter where you are. You can always switch back to your previous layout in Settings.
Customize your sound balance
In Accessibility settings, you can adjust the left/right sound balance for connected devices, such as speakers or headphones, separately from the sound balance for your phone speakers. This allows you to get the perfect balance out of your headphones without affecting how your ringtone and speakers sound.
New actions for Bixby Routines
You can now create routines that change your watch face or turn on advanced settings like Protect battery.
Customize your virtual memory
Choose the size of your phone's virtual memory with RAM Plus in Device care. Go with more to boost performance or less to save storage space.
Game optimizing service
CPU/GPU performance during early stages of gameplay will not be limited. (A performance management feature based on device temperature will be maintained.) The “Alternate game performance management mode” in Game Booster will be provided. 3rd party apps to bypass the Game Optimizing Service will be allowed.
Some apps will need to be updated separately after the One UI 4.1 update.

• The security of your device has been improved.

· The security of your device has been improved.

• Overall stability of your device has been improved.
• The security of your device has been improved.

• The security of your device has been improved.

· The security of your device has been improved.

• Overall stability of your device has been improved.
• The security of your device has been improved.

One UI 4 Upgrade (Android 12)

One UI 4 brings you a wide array of new features and enhancements for your Galaxy devices. More intuitive, more fun, more secure, and easier than ever.

Check out the changes below.


Color palette

Customize your phone with unique colors based on your wallpaper. Your colors will be applied to menus, buttons, backgrounds, and apps throughout your phone.


Privacy

One UI 4 offers strong privacy protection to make sure your personal information doesn’t fall into the wrong hands.

Permission info at a glance
See when each app accesses sensitive permissions such as Location, Camera, or Microphone in Permission usage. You can deny permissions for any apps you don’t feel comfortable with.

Camera and microphone indicators
Keep prying eyes and ears away. A green dot will appear in the upper right corner of the screen when any app is using the camera or microphone. You can also use quick panel controls to temporarily block all apps from using the camera or microphone.

Approximate location
Keep your exact location private. You can set apps that don't need to know exactly where you are to only have access your general area.

Clipboard protection
Keep your passwords, credit card numbers, and other sensitive information safe. You can choose to receive an alert whenever an app accesses content copied to the clipboard in another app.


Samsung Keyboard

More than just typing, Samsung Keyboard is all about expressing yourself and having fun.

Quick access to GIFs, emojis, and stickers
Self-expression is a tap away. Get to your emojis, GIFs, and stickers directly from the keyboard with a single button.

Animated emoji pairs
Can’t find the right emoji? Combine two emojis together, then add an animation to really get your feelings across.

Even more stickers
Spice up your conversations with a variety of new animated stickers available to download.

Writing assistant
Keep your grammar and spelling on point with the new Writing assistant, powered by Grammarly (English only).


Home screen

It all starts on the Home screen, where your favorite apps and features are just a tap away. One UI 4 helps you keep your home screen looking its best all the time.

New widget design
Widgets have been redesigned to look better than ever, with info that’s easy to see at a glance and a more consistent style.

Easier widget selection
Having trouble finding the right widget? You can now quickly scroll through the widget list to see what’s available from each app. You’ll also get recommendations for useful widgets to try out.


Lock screen

Use widgets to handle quick tasks without unlocking your phone, whether it’s controlling your music, checking your schedule, or capturing your best ideas.

Listen where you want
Switch audio output from buds to speakers to your phone, all from the Lock screen.

Voice recording
Got a great idea? Record a voice memo without unlocking your phone.

Calendar and schedule at once
Check today’s schedule along with your calendar for the rest of the month on the Lock screen.


Camera

Enjoy a simpler layout while you take pictures and videos. The scene optimizer button only appears in Photo mode if there’s low light or you’re scanning a document. Portrait and Night mode settings are now tucked away and more intuitive.

Lens and zoom
Lens icons show the magnification level, so you know how much you’re zoomed in.

Video that never misses a moment
Recording starts immediately after you tap the Record button, instead of when you release it, so that you catch those precious moments before they’re gone. In Photo mode, you can touch and hold the Shutter button to start recording a quick video, then drag your finger to the Lock icon to continue recording without holding down the Shutter.

Keep your single takes going
Add 5 seconds of extra time to Single take captures so you don’t miss a moment even if it goes into overtime. It’s also easier to select what you want to capture.

Pro photography
Stay in control with the redesigned Pro and Pro video mode settings. The cleaner look helps you focus on the shot, and the new level indicators added to the grid lines help you keep shots balanced.

Enhanced scanning
Scan documents, then tap the magnifying glass to zoom in and edit them immediately. You can also do more after scanning QR codes, like calling or emailing someone instead of just adding their contact info to your phone.

Portraits for pets
Take beautiful pictures of your furry friends with various portrait effects. Portrait mode now works with cats and dogs on both the front and rear cameras. Some portrait effects can only be applied after you take the picture.


Gallery

Whether you’ve got thousands of pictures and videos or just a few treasured moments, Gallery makes it easier to find what you need and keep your collection organized.

Enhanced stories
See your stories come to life with highlight videos that are created automatically. Just tap the preview at the top of each story to watch. You can also explore where the pictures in your stories were taken in the new Map view.

Easier albums
Sort through albums more easily—even if they’ve got tons of pictures. In fact, you can sort albums by how many pictures and videos they contain so that your favorite and most used albums are always at the top of the list. A cover image also appears at the top of the screen when you view an album to give you a better feel for what the album contains.

Worry-free remastering
Revert remastered pictures to their original versions at any time, even after they’re saved, so you never have to worry about losing the original.

More control over information
Change or remove the date, time, and location of your pictures to correct it or keep it private. You can also select several pictures and edit their information at once.


Photo and video editor

Sometimes your photos and videos need a few tweaks. One UI’s Photo and Video editors are there to make your pictures look their best before you share them.

Emojis and stickers
Use an emoji to cover the face of a shy friend or add stickers to create fun pictures and videos.

Video collages
Make moving collages that include pictures, videos, or a combination of both. Pick out the perfect moments and create your masterpiece.

Lighting control
Picture too dark because of bad lighting? The new Light balance feature helps you pull out all the details to make it look great.

Highlight reels
Easily turn a set of pictures and videos into a beautiful movie. Just choose a theme, and the AI will add the music and transitions automatically.

Never lose the original
Get bold with your editing! You can now revert both pictures and videos back to their original versions after they’re saved, or save them as copies to keep both the original and edited versions.

Paste from one picture to another
Experiment with mixing and matching faces, pets, buildings, and more. You can cut any object out of one picture and paste it into a different one.


AR Emoji

Use your own personal emojis to spice up your messages, make fun videos, and more. You can create a digital version of yourself, or try a different look. The possibilities are endless.

Jazz up your profile
Use an AR emoji as your profile picture in Contacts and Samsung account. You can choose from over 10 poses or create your own expressions.

Face stickers
Pretend to be your emoji with new stickers of your emoji’s face. Have fun decorating your photos and sharing them with your friends.

Dance the night away
Make cool dance videos with your AR emojis. Choose templates from 10 different categories including #Fun, #Cute, and #Party.

Design your own clothes
Ever wanted to be a fashion designer? You can now use your own drawings to create unique clothes for your AR emojis.


Sharing

One UI helps you stay connected and share your experiences with others. Just tap the Share button in any app.

More customization
Make sharing your own. You can customize the list of apps that appear when you share content to keep the clutter away and focus only on the apps you use regularly.

Easier navigation
New layout and better navigation makes sharing a breeze. Swipe left or right to scroll through apps and contacts when you’re sharing.

Photo sharing
When you share a picture that doesn’t look quite right, whether it’s out of focus or not framed well, we’ll let you know and give you suggestions for fixing it.


Calendar

One UI 4 makes it even easier to keep your busy life organized.

Check your schedule on the Home screen
A new widget shows your schedule for the day along with a full calendar for the month.

Quick add events
Need to add something to your calendar in a hurry? Just enter a title and you’re done.

More search options
You’ve got more ways than ever to find your calendar events. Choose from recent search keywords or filter by color or sticker.

Share with others
Sometimes you need to keep others in the loop. It’s now easier to share your calendars with other Galaxy users.

Easier date and time selection
Setting event details is a breeze with separate date and time options.

Recover deleted events
Events you delete will stay in the Trash for 30 days so you can get them back if you need them.


Samsung Internet

One UI’s fast and secure web browser now makes it even easier to find the webpages you’re looking for and protect your privacy.

Search suggestions
Get more search suggestions when you enter text in the address bar. Results will appear with an all new design.

Search from the Home screen
The new search widget helps you find what you’re looking for, right from the Home screen.

Start in Secret mode
To protect your privacy, Samsung Internet will automatically start in Secret mode if you were using Secret mode during your last browsing session.


Device Care

See your phone’s performance, security, and battery life at a glance, solve problems quickly, and get deep diagnostics for more complex issues.

Battery and security at a glance
Battery and security issues will appear right on the main screen so you can solve problems more quickly.

Understand your phone’s overall status
Your phone’s overall status is shown as an emoji, so you can understand instantly.

Diagnostic checks
Now you can get right to Samsung Members diagnostics from Device Care. If something seems wrong with your phone, try the diagnostic tests to find out what the problem is and get suggestions for solving it.


Samsung Health

Manage all your health data in one place and start building habits for a better tomorrow. Track your exercise, sleep, food intake, and more. One UI 4 makes it easier than ever.

All new design
Your important data is just a tap away. Everything you need is in easy reach as four tabs at the bottom of the screen.

My page
Get a summary of your health stats, achievements, personal bests, and progress on the My page tab.

Challenge your friends
Starting a Together challenge is easier than ever. Invite friends by sending a link.

More inclusive
Gender options are more inclusive. You can now choose Other or Prefer not to say.

More food options
Recording your food intake is easier with more snacks added to the food tracker.


Bixby Routines

Make your phone do more for you. Turn on Wi-Fi automatically when you come home, or set your phone to silent when you’re at work. One UI 4 gives you even more possibilities.

More conditions
More conditions are available for your routines. Start a routine during a call or when a certain notification arrives.

More actions
You can now turn on Enhanced processing with a routine. There are also more options such as connecting and disconnecting Bluetooth devices.

More control
Reorder actions by touching and holding actions on the edit page. Advanced options have also been added to let you wait before an action starts, confirm actions, and more.

More combinations
We’ve removed restrictions for some combinations of conditions and actions so you can do even more with your routines.

More customization
Create custom icons for your routines using the Camera or an image from Gallery.


Accessibility

One UI is designed for everyone. In One UI 4, you’ll get even more options to help you use your phone in the way that’s most comfortable for you.

Always there when you need it
Access accessibility features more quickly with a floating button that’s always available.

Mouse gestures
Perform actions more quickly by moving your mouse pointer to one of the 4 corners of the screen.

Adjust your screen at once
Adjust contrast and size at the same time with custom Display mode (High contrast or Large display).

Eye comfort
More visibility options are available to meet your needs. You can reduce transparency or blur.

Extra dim screen
If your screen is too bright, even at the lowest brightness setting, turn on Extra dim for more comfortable reading in the dark.

Customizable flash notifications
Make the screen flash when you receive a notification. You customize colors for each app so you can easily determine where a notification is coming from.

Easier magnification
Magnifier window has been merged with the new Magnification menu, giving you more options and more control for magnifying content on the screen.


More features and improvements

Better Always On Display
Never miss a notification. You can now set Always On Display to turn on whenever you get a notification. New animated stickers are also available to keep your Always On Display looking fresh.

Enhanced Dark mode
To keep you comfortable in the dark, Dark mode now automatically dims wallpapers and icons. Illustrations in Samsung apps now have Dark mode versions with darker colors for a more consistent experience that’s easier on your eyes.

Charging info at a glance
When you start charging, different visual effects let you know your charging speed more intuitively.

Easier brightness control
A bigger brightness bar in the quick panel makes it easier to change screen brightness with a swipe.

Tips preview videos
Learn more about what your Galaxy can do with preview videos on the main screen of the Tips app.

Safety and emergency menu
The new Safety and emergency menu in Settings lets you manage your emergency contacts and safety information all in one place.

Settings search enhancements
Improved search features help you find the settings you need, when you need them. You’ll get suggestions for related features depending on what you search for.

Keep your eyes on the road
The new Driving monitor in Digital Wellbeing keeps track of when you use your phone while driving. You’ll get reports on how much you used your phone and which apps you used.

Skip an alarm just once
Feel like sleeping in? You can now turn off an alarm just for one occurrence. It will turn back on automatically after it’s skipped.

Day or night at a glance
Have a friend on the other side of the world? It’s easier to see if it’s a good time to contact them. The dual clock widget now shows different background colors for each city depending on whether it’s day or night.

Switch from texts to calls
Texting not cutting it? Tap the person’s name at the top of the conversation to see their details or start a voice or video call.

More search results in Messages
Now you can search your messages for photos, videos, web links, and more. The results are all filtered so you can jump right to what you’re looking for.

Easier search in My Files
Find the file you’re looking for, even if there’s a typo or the name doesn’t match exactly. The Recent files area has also been expanded to help you quickly locate files you’ve used or received recently.

More complete desktop experience
More apps are resizable in Samsung DeX, so you can multitask and get more done throughout the day. You can also change the touchpad scrolling direction in DeX settings to match your personal preference.

Enhanced Edge panels
Keep your current app in view while using edge panels. Blurring has been removed to help you see more at once.

Resizable picture-in-picture
If a floating video is getting in the way, pinch your fingers together to make it smaller. Want to see more? Spread your fingers apart to make it bigger.

Quick access to pop-up window options
For easier multitasking, you can pin the window options menu to the top of the window to make it easier to access.


Some apps will need to be updated separately after the One UI 4 upgrade.

· The security of your device has been improved.

· The security of your device has been improved.

• Overall stability of your device has been improved.
• The security of your device has been improved.

· The security of your device has been improved.

• Overall stability of your device has been improved.
• The security of your device has been improved.

· The security of your device has been improved.

• The performance of Camera has been improved
• Overall device performance has been improved.
• The security of your device has been improved.

· The security of your device has been improved.

• The performance of Camera has been improved
• Enhanced Quick Share
- Improve file sharing between Galaxy devices using Quick Share.
• The security of your device has been improved.

• The performance of Camera has been improved
• Overall device performance has been improved.
• The security of your device has been improved.

• The performance of Camera has been improved
• Overall device performance has been improved.
• The security of your device has been improved.

• The performance of Camera has been improved
• Overall device performance has been improved.
• The security of your device has been improved.

We recommend using Samsung’s own utilities, Samsung Smart Switch and OTA (Over-the-air), to upgrade devices. Use our site only if you are 100% sure about the risks involved in flashing your device SM-G991U1: ATT. We is not responsible for any damage caused by using the files on this website.
The Firmwares provided here are all official Samsung's Android Firmwares and has NOT been modified by anyway as we get them directly from KIES servers.
We live-monitor all firmware updates for every Samsung device, in over 500 regions.
Beware, Manually flashing firmwares may brick your device, use it at your own risk and follow our tutorial steps.

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