Samsung Galaxy S23 Ultra S918USQU8GZIF
SM-S918U 3 countries Android 17

Samsung Galaxy S23 Ultra S918USQU8GZIF Firmware

Samsung Galaxy S23 Ultra S918USQU8GZIF is an Android 17 firmware for DSA, DSH, United States (ATT, TMB, TMK, USC). It is the same firmware configured per region and carrier (CSC). Find your country below, verify the file and download for free. Compared with the previous build S918USQS8FZI1: Android updated from Android 16 to Android 17; security patch 2026-10-05 instead of 2026-09-05. This is the newest build for SM-S918U.

OS updates guaranteed until: Android 17. Security updates until: Jan 23, 2028
9.3/10 (17)797 times
Android 17
OS Version
2026-09-29
Build Date
2026-10-05
Security patch
3
Countries
6
CSC codes
8
Bootloader binary

Bootloader binary 8. Flashing firmware with a lower binary is usually blocked by Samsung anti-rollback.

All regional downloads

Pick your region (CSC) to download the matching firmware package.

Paste your current build number from Settings > About phone (About tablet) > Software information, or the output of *#1234#.
    MODEM/CP Version: S918USQU8GZIF
    ModelRegionCSC VersionRelease dateSizeFile nameDownload
    SM-S918U
    ATT, TMB, TMK, USC United States
    DSA, DSH
    S918UOYN8GZIF 2026-10-19 11.309 GiB
    SM-S918U_5_20260929203231_wrjeallh0p_fac.zip

    No matching downloads

    Device specifications

    • Display diagonal17.3 cm (6.8")
    • Display resolution3088 x 1440 pixels
    • RAM8 GB
    • Rear camera resolution200 MP
    • Rear camera typeQuad camera
    • Battery capacity5000 mAh
    • Weight233 g

    Specifications of SM-S918B, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.

    What's new in S918USQU8GZIF

    One UI 9
    Galaxy AI

    Interpreter keeps your conversation in front of you
    In conversation mode, you can scroll through the whole conversation while you’re still talking.

    Productivity and multitasking

    More customizable quick panel
    You can now rearrange and customize the controls in your quick panel even more than before. You can change the size of the brightness and volume sliders as well as the media player. You can also separate the sound mode button from the volume slider.

    Privacy, security, and device protection

    Warranty and care
    The new Warranty and care menu in settings lets you check your warranty information and access diagnostic checks and useful information for keeping your Galaxy in top condition.

    Lock down your phone quickly
    It's now easier to securely lock your phone in a hurry. Just press and hold the Volume down and Side buttons at the same time or tap the Power button in the quick panel. This prevents biometrics from being used the next time you unlock your phone.

    Location access transparency
    Stay on top of your location privacy. A blue indicator will appear at the top of the screen when an app accesses your location. Tap the indicator in the quick panel to see which app it is.

    AI privacy alerts
    Get help protecting your personal data. AI will monitor how apps use permissions and notify you about unnecessary access to your personal data.

    Samsung Health

    New look for Samsung Health
    Samsung Health has been redesigned to make your health data easier to understand. Enjoy clearer visuals, improved charts, and a more engaging experience to help you reach your health goals.

    Customize your Health home screen
    Resize cards and organize them by category, like Activity, Sleep, Mindfulness, and Nutrition, so your top priorities are easy to access.

    Log health data quickly
    It's now easier to add your health information right from the Samsung Health home screen. You can log your mood, meals, and more. You can even use the camera for faster input.

    Advanced trend analysis
    Track your progress with improved trend charts in Samsung Health. View data in hourly, daily, or weekly intervals, pinch to zoom in for a closer look, and overlay multiple charts to compare your performance across different periods.

    Monitor changes in your sleep vitals
    Samsung Health helps you notice meaningful changes in your sleep health data. Use Galaxy Watch or Ring measurements to better understand your daily health patterns.

    Manage your heart health
    Track key health metrics and lifestyle factors that affect your heart. A daily score based on your sleep, exercise, BMI, and blood pressure helps you better understand your current heart health trends.

    Track your cardio load
    See how your workouts and activity impact your heart so you'll know when to push harder and when to rest. Your target cardio load range adjusts daily based on your recent activity and training focus.

    Check your fitness index
    Your Fitness Index is an overall score calculated using five key fitness metrics: body composition, cardio, strength, flexibility, and endurance. Set a goal and unlock personalized insights tailored to your results.

    Keep your ears safe
    The new Hearing tracker monitors sound levels detected by your Galaxy Watch and headphone audio levels to help you manage your exposure to loud sounds.

    View your cycle and body rhythm
    Get a more personalized view of your cycle and body rhythm with new cycle tracking options. You can view your cycle information in your calendar and better understand your health patterns.

    Bixby

    Manage your conversations
    Keep your chats organized. Search them, rename them, or pin your favorites. You can also delete all of your past conversations at once.

    Bixby on the Home screen
    Add a Bixby widget to type or talk to Bixby or jump directly to your conversation history.

    Accessibility

    Discover new Accessibility features
    Check the What's new menu in Accessibility settings to learn about and try the latest Accessibility features for your Galaxy.

    Text spotlight for easier reading
    Need a closer look? Tap any text on the screen to show it enlarged and highlighted in its own window. You can also customize the font size, colors, and other settings to match your preferences.

    Physical keyboard shortcuts
    Use shortcuts on your physical keyboard to access the Accessibility settings you need without touching the screen.

    Mouse keys enhancements
    New options are available when using your keyboard for mouse interactions including speed and acceleration control. You can also use the keyboard's number pad to point and click.

    Replace swipe with single tap
    The Replace swipe with single tap option is now located in the Dexterity and interaction menu instead of the Assistant menu for easier access.

    Select to speak
    Get quick audio readouts without turning on full TalkBack. With the new Select to speak feature, you can select an item on your screen, like text or an image, and hear it read or described out loud.

    Improved TalkBack updates
    TalkBack updates can now be applied with a simple app update from the Play Store, helping you get the latest accessibility features and enhancements.

    Even more improvements

    New Lock screen clock
    The default clock on your Lock screen has been redesigned with a cleaner and more modern look that adapts to match your wallpaper.

    Samsung DeX enhancements
    It's easier to move an app window from one desktop to another using the menu at the top of the window. Desktop previews are now available at the top of the Recents screen, making it easier to switch with a single tap.

    How to flash S918USQU8GZIF

    • S918USQU8GZIF has bootloader binary 8. Your device must run binary 8 or lower: it is the 5th character from the end of your current build number.
    • CSC: Use CSC for a clean install, to change the region (CSC code), to downgrade or to repair a device that does not boot.
    • HOME_CSC: Use HOME_CSC to update the same model and region while keeping your data. Back up anyway: a failed update can still require a reset.
    • The Download Mode key combo depends on the model: see all combos.
    Full flashing guide
    Beware: Manually flashing firmwares may brick your device. Use it at your own risk and follow our tutorial steps.

    Frequently Asked Questions

    S918USQU8GZIF is Android 17 firmware for Samsung Galaxy S23 Ultra, released for DSA, DSH, United States (ATT, TMB, TMK, USC). It includes the 2026-10-05 security patch. Samsung built it on 2026-09-29.

    Yes. S918USQU8GZIF is the newest build for SM-S918U on SamFirm. The previous build was S918USQS8FZI1.

    Download the package for your region (CSC) and unzip it. In Odin, load each file into the slot with the same name: BL, AP, CP (if the package has one) and CSC, or HOME_CSC to keep your data. Odin checks the built-in checksum of every .tar.md5 file before flashing. The download is 11.309 GiB; keep about twice that free on the computer to unzip it. The Samsung Galaxy S23 Ultra must be on bootloader binary 8 or lower.

    This build uses bootloader binary 8. It can be flashed on a Samsung Galaxy S23 Ultra running binary 8 or lower; if the device already has a higher binary, Odin stops with "SW REV CHECK FAIL". 4 other builds of this model use the same binary, so you can switch between them in both directions.

    Other builds and changelog for Samsung Galaxy S23 Ultra

    One UI 9
    Galaxy AI

    Interpreter keeps your conversation in front of you
    In conversation mode, you can scroll through the whole conversation while you’re still talking.

    Productivity and multitasking

    More customizable quick panel
    You can now rearrange and customize the controls in your quick panel even more than before. You can change the size of the brightness and volume sliders as well as the media player. You can also separate the sound mode button from the volume slider.

    Privacy, sec...

    • 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.

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

    Show 15 older builds

    • Security
    The device is protected with improved security.

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

    One UI 8.5
    Visual design

    Fresh new look
    One UI seamlessly integrates into your daily routine by combining immersive visuals with meaningful personalization for a more refined and sophisticated design. Transparent blur effects add depth and make content easier to navigate, while floating elements react organically to your workflow for a more focused experience. Through familiar and intuitive data visualization, One UI delivers a design that feels both personal and relatable, helping you focus...

    • 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.

    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.

    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.

    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.

    Translate emergency alerts
    Never miss importa...

    • Security
    The device is protected with improved security.

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

    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.

    Translate emergency alerts
    Never miss importa...

    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.

    Translate emergency alerts
    Never miss importa...