Samsung firmwares, SM-S921U (ATT) | EN

⏩ Download the latest Samsung firmware ✅ SM-S921U ATT. Full list of firmwares available for download

Looking for the latest firmware for your Samsung SM-S921U? 📱 You've come to the right place! We offer a comprehensive and reliable source for all your SM-S921U firmware needs. Download the official and tested firmware updates directly from our site. We pride ourselves on providing a safe and secure download experience. 💯 Don't risk downloading from untrusted sources that may contain malware or corrupted files. Get the peace of mind knowing you're using genuine firmware designed for your SM-S921U. We keep our firmware database constantly updated to ensure you have access to the newest releases, improving performance, security, and stability of your device. Find the right SM-S921U firmware version for your specific region and carrier. Enjoy improved device performance, enhanced security features, and the latest Android updates. Update your Samsung SM-S921U today and experience the difference! Our easy-to-use search and download process makes updating your firmware a breeze. Skip the hassle and get the firmware you need quickly and safely. Protect your device and data by choosing only verified firmware updates from our trusted source. We are dedicated to providing the best SM-S921U firmware download experience. 🚀 Improve your phone's speed, stability and overall user experience by using the correct firmware. Download it now!✅

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Samsung firmware list
DeviceModelRegionPDA/AP VersionOs VersionBuild Date
Samsung Galaxy S24SM-S921UATTS921USQS4CYJ1/S921UOYN4CYJ1/S921USQS4CYJ116
Samsung Galaxy S24SM-S921UATTS921USQU4CYI9/S921UOYN4CYI9/S921USQU4CYI916
Samsung Galaxy S24SM-S921UATTS921USQS4BYG2/S921UOYN4BYG2/S921USQS4BYG215
Samsung Galaxy S24SM-S921UATTS921USQS4BYF5/S921UOYN4BYF5/S921USQS4BYF515
Samsung Galaxy S24SM-S921UATTS921USQS4BYF2/S921UOYN4BYF2/S921USQS4BYF215
Samsung Galaxy S24SM-S921UATTS921USQS4BYE4/S921UOYN4BYE4/S921USQS4BYE415
Samsung Galaxy S24SM-S921UATTS921USQU4BYD9/S921UOYN4BYD9/S921USQU4BYD915
Samsung Galaxy S24SM-S921UATTS921USQS4AYB3/S921UOYN4AYB3/S921USQS4AYB314
Samsung Galaxy S24SM-S921UATTS921USQS4AYA1/S921UOYN4AYA1/S921USQS4AYA114
Galaxy S24SM-S921UATTS921USQS4AXL4/S921UOYN4AXL4/S921USQS4AXL414

Changelog: SM-S921U(ATT)

One UI 8.0 (Android 16)



Galaxy AI

See calls on the screen
Call captions show what each person says on the screen in real time during calls. Follow the conversation on your screen to make sure you don’t miss anything.

Create unique pet portraits
Bring out your pet's personality with Portrait studio. You can now apply portrait effects to pictures of dogs and cats in addition to people. Choose from styles like Fisheye lens, oil painting, and more.

Clean up sound
Use Audio eraser to automatically reduce the volume of wind and other background noises so you can focus on who's talking. Audio eraser can be used in Gallery, Video Player, Samsung Notes, Voice Recorder, and Phone.

Stay up to date with Now brief
Get timely updates and useful information throughout the day based on your interests and context. You can access the Now brief from the Edge panel, Home screen widget, and notifications on your Now bar.

Translate emergency alerts
Never miss important alerts even if they’re not in your language. When you receive an emergency alert in a language that’s different from your system language, Galaxy AI will automatically translate it for you.

Faster AI select
No more waiting. When you start AI select, you can now select an area of the screen immediately.

More convenient AI results
When you summarize or translate content in supported apps in landscape view, the results will now appear alongside the original so you can view them together.



Personalization

New Lock screen clock
A stylish clock with a new font is available to make your Lock screen stand out from the crowd. The new clock moves with the shape of your photo and blends seamlessly to avoid covering pictures of people or animals.

Beautiful new wallpapers
More choices are available to help you find the wallpaper that's right for you. New additions include interactive and dynamic wallpapers like color gradients that change over time.

Wallpaper suggestions
Get help finding new wallpapers. Your phone will recommend the best photos from your Gallery in categories such as landscapes, cities, flowers, pets, and people.



Productivity

Check stock prices without unlocking
Stocks you follow on Google Finance with big price changes will appear on your Now bar at the end of the trading day.

Easier file sharing with Quick Share
It's never been easier to send and receive files. Tap the Quick Share button in quick settings to get started. You can receive files while the Quick Share screen is open and send files to others directly from Quick Share.

Sticky notes
Add quick annotations on top of documents in Samsung Notes. There's no limit to the number of sticky notes you can add, and it's easy to remove them later without disturbing the original document.

Find downloads fast
You can now filter files based on the app that was used to download them. Works in the Downloaded and Recent views in My Files.

Redesigned Samsung Internet
Access the features you need quickly. The Samsung Internet menu has been optimized to make it easy to access the features you use most. You can also customize the layout to match your personal preferences.

Scientific calculator in portrait view
Use the scientific calculator without the need to rotate the screen. The scientific calculator now works in portrait view in addition to landscape.



Multitasking

Do more in DeX on connected displays
You can now add widgets to your Home screen when using DeX on a connected display as well as control settings for the mouse and on-screen keyboard.

Enhanced display support for DeX
The new Samsung DeX gives you more options when connected to an external monitor or TV. You can choose an optimized display resolution up to WQHD and rotate the display 90, 180, or 270 degrees.

Enhanced split screen view
While 2 apps are open in split screen view, you can push one app against the edge of the screen to keep it partially visible while giving most of your focus to the other app. Tap the smaller app any time to switch between them quickly.



Reminder

New Reminder interface
The Reminder app has been redesigned with categories shown at the top of the screen, making it easier to see how many reminders are in each category with a quick glance. Custom categories can be hidden with a quick tap to free up more screen space. Tap one more time to make them appear again.

New sample reminders
Discover the power of reminders. Sample reminder templates are now available in the Reminder app. Explore these reminders to see what you can do to manage important tasks in your life.

Add reminders easily
It's never been easier to add new reminders. Just type your reminder into the box at the bottom of the screen. Suggestions will appear as you type that you can tap to save time. You can add checklists, locations, and pictures using the buttons below the text box. Or, if you don't want to type at all, tap the Mic icon for voice input.



Calendar

Manage reminders in Calendar
You can easily create reminders in the Calendar app without opening the Reminder app. Whenever you tap the + button, you'll have the choice of adding an event or a reminder. You can also drag and drop reminders on your calendar to reschedule them.

Add events quickly
When you start adding an event in the quick add menu, you'll get suggestions for event names and times based on your past events. Just tap one of the suggestions to add an event without additional typing.



Samsung Health

Running coach
Whether you're a beginner or an experienced runner, the new Running coach feature in Samsung Health provides personalized training programs and tips to help you run farther and faster while minimizing the risk of injury. Works with Galaxy Watch7 or higher.

Bedtime guidance
Get to sleep at the right time so you wake up feeling refreshed. The new Bedtime guidance feature analyzes your sleep data and recommends the best time to go to sleep each night.

Running challenges
In addition to step challenges, you can now challenge your friends to run. You can set a target distance and see who gets there the fastest or set a time limit and see who runs the farthest.

Check your antioxidant intake
The Antioxidant index (Labs) feature uses your Galaxy Watch to detect the level of carotenoids in your skin. Carotenoids are a type of antioxidant contained in fruits and vegetables that can help prevent physical aging. Works with Galaxy Watch8 and Galaxy Watch Ultra.

Food recording reminders
Stay on track to meet your calorie goals. You can now set reminders for recording your food intake in Samsung Health.

Track your vascular load
Use your Galaxy Watch to measure your vascular load, which is the amount of stress on your blood vessels. First, create a baseline measurement by wearing your watch while sleeping for at least 3 days, then you'll be able to see when your vascular load gets higher or lower over time. Works with Galaxy Watch8 and Galaxy Watch Ultra.

Share health data with friends and family
You can now share health data with anyone you choose, even if they're not a member of your family group.



Photo and video

Swipe up or down to open quick controls
Access quick controls in Camera even quicker than before by swiping up or down anywhere in the preview area. In Camera settings, change the Swipe up/down option to open quick controls.

Get perfect lighting with exposure monitors
The new Exposure monitor for Pro and Pro video modes helps you get the right exposure in your pictures and videos. Choose Zebra pattern to show stripes on areas that are over-exposed, or choose False color to color-code everything based on its exposure level.

Advanced editing with Log videos
Get pro-level control over video color grading by recording in log format. Just turn on Log in Camera settings and the preview, then start shooting. Works in Video and Pro Video modes.



Audio enhancements

Quick access to Galaxy Buds settings
It's easier than ever before to control your Galaxy Buds. You can now adjust Buds settings directly from your phone's Settings without the need to open the Galaxy Wearable app.

Easily connect to Auracast broadcasts
Auracast allows you to broadcast audio from one device to multiple listening devices at the same time. It's now easier to connect to Auracast broadcasts by simply scanning a QR code. You can also generate a QR code to let others connect to your broadcast.



Communication

Improved profile cards
It's easier to create and edit your profile card to get the perfect layout for your name and picture. After creating, you can share your profile card so other people can see it when you call them.

Review recorded calls in Contacts
It's now easier to review your past conversations. Calls you've recorded now appear on the contact history screen.



Security and privacy

Enhanced Secure Folder
Keep sensitive apps and data in a separate, protected area of your phone. You can now set Secure Folder to close apps and prevent notifications when you lock it. You can also completely hide and encrypt your Secure Folder for maximum protection.

Stronger account security
Knox Matrix regularly scans devices signed in to your Samsung account for security risks. When a serious risk is found on a device, that device will be automatically signed out of your Samsung account to protect the security risk from spreading to your account and other devices. You can check the security status of your devices any time in Security and privacy settings.

Show or hide notification content while locked
The option to show or hide notification content while your phone is locked is now located in Notifications settings. Choose to show content for quick access to notifications without unlocking your phone, or choose to hide content to keep your notifications private and prevent others from seeing them.



Accessibility

Pinch and zoom with the Assistant menu
The Assistant menu now provides more ways to zoom in and out on the screen. In addition to dragging with one finger, you can now adjust the zoom level by pressing buttons on the screen.

Control mouse actions with your keyboard
If you can't or don't want to use a mouse, turn on Mouse keys in Accessibility settings to use your physical keyboard to move the mouse pointer, click, hold, and scroll.

Magnify your keyboard
You can now make the keys on the on-screen keyboard larger so they're easier to see and tap. Turn on Magnify keyboard while typing in Magnification settings to try it.

Easily pair Bluetooth hearing aids
You can now pair and connect your Bluetooth hearing aid devices directly on the Hearing aid support screen in Accessibility settings.



Modes and routines

New preset routines
Check out the new preset routines for weather and other advanced conditions. Use them as they are, or customize them to meet your needs.

New routine actions
New actions are available for getting data from the Clock, Calendar, and Samsung Notes apps. After you get data, you can use it in other conditions or actions in your routine.



Even more improvements

Easily organize alarms
You can now add existing alarms to an alarm group by tapping the + button on the Alarm group screen. You can also add an alarm group to a widget on your Home screen so you can turn all of the alarms in the group on or off with a single tap.

Enhanced app notification settings
You can now choose the pop-up notification style for each app separately in the app’s notification settings.

Get quicker support
Enjoy quicker check-ins when you visit Samsung service centers. You can use NFC or scan a QR code to share basic information such as your name and phone number with staff without filling out any forms. Your data is encrypted and can only be accessed by Samsung support staff.

Revamped weather visuals
The Weather app now provides more rich and realistic images to help you intuitively understand the current weather conditions.

• Security
The device is protected with improved security.

These changes may vary depending on the model, country, or network operator of the customer environment.

• Security
The device is protected with improved security.

These changes may vary depending on the model, country, or network operator of the customer environment.

• Security

The device is protected with improved security.

These changes may vary depending on the model, country, or network operator of the customer environment.

• Security
The device is protected with improved security.

• Security
The device is protected with improved security.

• Security
The device is protected with improved security.

• Security
The device is protected with improved security.

• Security
The device is protected with improved security.

• Security
The device is protected with improved security.

• Security
The device is protected with improved security.

• Stability and reliability
Device behavior has been improved.

• Auto Blocker
After the update, when “Auto Blocker” is on with “Maximum restrictions”, USB devices will not be allowed to connect to this device except charging.
• Security
The device is protected with improved security.

• Security
The device is protected with improved security.

• Security
The device is protected with improved security.

One UI Update



Galaxy AI

Turn simple sketches into awesome images
Start with a simple drawing, choose your style, and let Galaxy AI transform it into a captivating work of art. Sketch to image is available in Samsung Notes, Photo Editor, Smart select, and the Edge panels.

Create unique portraits
With a wide variety of AI-generated portrait styles, you can create a whole new look for your own profile image in Contacts or someone else’s, or use Photo Editor to invent something new for any of your photos that have faces in them.

Let your phone do the writing for you
When you need to write something, whether it’s a text, an email, or a social media post, you can start by giving Samsung Keyboard's new Composer a short request or snippet of text, then let Galaxy AI do the rest.

Translate calls in more apps
Simply talk over the phone and get translation in real time, helping you break down language barriers. And now, in addition to the Samsung Phone app, you can get real-time translation in supported voice calling apps like Google Meet and WhatsApp. During a call, tap Live translate in the quick panel to start translating.

Translate image text on webpages
Get the entire webpage in your language. When you translate a webpage in Samsung Internet, all of the text on the page gets translated, whether it’s formatted as text or part of an image or photo.

Translate in Listening mode
Listen in, no matter which language is being spoken. Interpreter's new Listening mode lets you translate one-way communication, like a lecture or presentation, into your language.

Turn voice recordings into notes
It’s easier than ever before to create notes with Samsung Notes, even using just your voice. You can now transcribe voice recordings into text notes that you can edit, summarize, and more.

Translate and summarize PDFs
Note assist's translation and summary features now work with PDF files without the need to convert them to notes first. Translated text will appear in the original format of the PDF.

Auto detect languages in Voice Recorder
Use Transcript assist to convert recordings of meetings, lectures, voice memos, and more into text. The language of your recording will now be automatically detected, so you can skip the language choice and go right to the transcript.

Edit voice recordings and transcripts
After you create a transcript in Voice Recorder, you can now edit the text to fix any errors, remove unneeded parts, or add something that’s missing. You can also edit the audio recording itself by removing sections you don't need.

Enhance your wallpaper with special weather effects
Choose a photo to use for your photo ambient wallpaper and watch it change along with the time of day and weather conditions in the location you set for your weather widget. If it's snowing or raining in that location, you'll see the same conditions in your photo, and the sun will rise and set according the local time in that location.



Create epic images

Bring photos to life with Live effects
Give your subjects a lifelike appearance by applying stunning cinematic effects to people and animals in your photos.

Quickly save and share Instant slow-mo clips
After watching a video in instant slow-mo, you can save the portion of the video that you slowed down. When you share a video, the last section you watched in slow-mo is also available for sharing.

Create fun animated stickers and GIFs
Touch and hold any object from a motion photo to clip it, then instantly turn it into an animated sticker or GIF that you can share with others.

Clip just what you need
Touch and hold a person or object in any photo to clip it. You can now clip multiple items at once. After clipping, you can easily turn your selection into a sticker or copy and paste it somewhere else.



Unlock a healthier you

Discover new insights and stay motivated
Stay inspired throughout your health experience with new wellness tips in Samsung Health. Wellness tips offer valuable insights and encouragement to help you achieve your health goals.

Monitor your energy levels with Galaxy AI
Samsung Health's new energy score shows your physical and mental condition based on your sleep and physical activity. If your energy score is low, it may be best to take a rest. If your energy score is high, it could be time set a personal best in your favorite exercise. Galaxy AI provides personalized insights and motivation to keep you on the right track.

Get more detailed sleep analysis
New sleep insights give you more detailed and accurate analysis of your sleep quality. Your comprehensive sleep report now includes your heart rate, respiratory rate, and the amount of time it takes you to fall asleep after you lie down.

Share health data with your family
Encourage healthy habits among your loved ones by granting them access to your Samsung Health data including your steps, exercise records, and sleep data. You're always in control of which family members can see your data, and you can remove access at any time.

Make your own workout routines
Combine a series of different exercises together for a custom workout routine. You can set targets for sets, reps, time, and more. After you start your routine, your watch can automatically switch to the next exercise when you meet your target. You can optionally add breaks in between exercises. When your routine is finished, you can view your results for the entire routine all in one place.

Connect cycling power meters
Get more useful data from your cycling workouts. Samsung Health now supports connecting to cycling power meters attached to your bike. A power meter allows you to track your functional threshold power (FTP) to give you more insights into your training.



Be more productive

Suggested actions for Smart select
Take action quickly based on what's shown on your screen. When you select something on your screen with Smart select, you'll now get suggested actions related to your selection. You can quickly call phone numbers, locate addresses, enhance images, and more. Smart select can now be accessed in the Apps Edge panel.

Enhanced multi window experience
It's easier than ever to switch between picture-in-picture and split screen. Touch and hold a video playing in picture-in-picture, then drag it to the side of the screen where you want to play it.

Easier file copying and moving
It's easier than ever to find the right folder when copying or moving files in My Files. You can now choose the destination folder in a pop-up window so you can easily return the original folder when you're finished.

Create file shortcuts on the Home screen
Get faster access to the files you use most. Touch and hold any file in My Files, then use your other hand to navigate to the Home screen. Drop the file anywhere on your Home screen to create a shortcut to the file.

Improved thumbnail image display
See how images will appear before you open them. Thumbnail images for pictures and videos in My Files now appear in the original aspect ratio.

Automate your watch with modes and routines
Modes you set up on your phone, such as Sleep mode, Exercise mode, or Theater mode, can now automatically control more of your watch's settings based on what you’re doing or where you are. In addition to Watch faces and Do not disturb, modes can now also control Always On Display, Raise wrist to wake, Touch screen to wake, Turn bezel to wake, Sound mode, and Disconnection alerts. You can also use routines to control these watch actions.

More message filtering options
When you create a routine that starts when you receive a message or notification, you now have more fine-tuned control. You can add multiple keywords and choose to start the routine when all keywords are included or when any keyword is included in the message or notification.



Even more improvements

Design and share your profile card
Design your own profile card with your name and picture that other Galaxy users can see when you call them or when they view your contact info. You can also create profile cards for other people in your contacts so you can see their card when they call you.

Skim through videos quickly
Save time and effort with new video seek controls in the Video Player app. Double tap the right side of the screen to go forward 5 seconds. Double tap the left side of the screen to go back 5 seconds.

Answer calls with a tap instead of a swipe
If you have difficulty swiping, you can set your phone to answer calls with a simple tap of a button.

Answer all calls using the speaker
Enjoy easier hands-free calls. If you prefer taking calls on the speaker, a new setting lets you answer all calls on the speaker by default instead of manually switching for each call.

Get frequent weather updates
Stay prepared for sudden weather changes. Weather information now automatically updates at least once every hour to make sure you always have the latest forecasts.

Extra-strong security
If you have special security needs, you can now set Auto Blocker to apply maximum restrictions to get the highest level of protection against malware and security threats. Hyperlinks and automatic downloading attachments in messages are blocked, location data is removed when sharing pictures, and shared albums in Gallery can't be used.

Enhanced Assistant menu
You can now open the quick panel with just one tap. You also have greater control of physical buttons. Use the Assistant menu to press and hold or double press the Side button.

• Security
The device is protected with improved security.

• Security
The device is protected with improved security.

· The security of your device has been improved.

· 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.

• Added a Vividness option
You can use this option to adjust the vividness of your screen.
• Camera
The image quality and sharpness optimization code has been applied.
• Stability and reliability
Device behavior has been improved.
• Security
The device is protected with improved security.

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-S921U: 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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