Samsung Galaxy S23 S911USQS8FZI1
SM-S911U 4 countries Android 16

Samsung Galaxy S23 S911USQS8FZI1 Firmware

Samsung Galaxy S23 S911USQS8FZI1 is an Android 16 firmware for 4 countries, 10 CSC codes. 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 S911USQS8FZH3: security patch 2026-09-05 instead of 2026-08-05. A newer build for SM-S911U is available: S911USQU8GZIF.

OS updates guaranteed until: Android 17Security updates until: Jan 29, 2028
Download firmware
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Android 16
OS Version
2026-09-15
Build Date
2026-09-05
Security patch
4
Countries
10
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#.
    3
    MODEM/CP Version: S911USQS8FZI1
    ModelRegionCSC VersionRelease dateSizeFile nameDownload
    SM-S911U
    ATT, CCT, TMB, TMK, USC, VZW United States
    CHA
    		S911UOYN8FZI1 2026-09-24 10.647 GiB
    SM-S911U_5_20260915215141_bt3wn53j7u_fac.zip
    SM-S911U
    XAA United States
    DSA
    		S911UOYN8FZI1 2026-09-24 10.655 GiB
    SM-S911U_5_20260915230631_5a1druevmm_fac.zip
    SM-S911U
    DSH
    		S911UOYN8FZI1 2026-09-24 10.655 GiB
    SM-S911U_5_20260915224301_7y002yvapw_fac.zip

    No matching downloads

    How to flash S911USQS8FZI1

    • S911USQS8FZI1 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.

    What's new in S911USQS8FZI1

    • 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 patch: September 2026

    SMR Sep-2026 fixes 80 vulnerabilities, 20 of them critical. Android Security Bulletin: 58, Samsung Semiconductor: 1, Samsung-specific issues (SVE): 21.

    Most severe Samsung fixes:

    • critical Heap-based buffer overflow in DNG decoder of libimagecodec.quram.so prior to SMR Sep-2026 Release 1 allows remote attackers to execute arbitrary code. (CVE-2026-21095)
    • critical Heap-based buffer overflow in JPEG decoder of libimagecodec.quram.so prior to SMR Sep-2026 Release 1 allows remote attackers to execute arbitrary code. (CVE-2026-21096)
    • high Out-of-bounds write in libmdnie.so prior to SMR Sep-2026 Release 1 allows local attackers to execute arbitrary code with system server privilege. (CVE-2026-21087)

    All fixes and Galaxy models with this patch

    Rollout of S911USQS8FZI1 by region

    First release
    September 24, 2026
    Last region
    September 29, 2026
    Duration
    6 days
    Regions
    10
    1. Day 1 · · 7 regions
      United StatesATTTMBTMKUSCVZWDSADSH
    2. Day 6 · · 3 regions
      United StatesCCTXAACHA

    Device specifications

    • Launched withAndroid 13
    • Display diagonal15.5 cm (6.1")
    • Display resolution2340 x 1080 pixels
    • RAM8 GB
    • Rear camera resolution50 MP
    • Rear camera typeTriple camera
    • Battery capacity3900 mAh
    • Weight168 g

    Specifications of SM-S911B, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.

    Frequently Asked Questions

    S911USQS8FZI1 is Android 16 firmware for Samsung Galaxy S23, released for 4 countries, 10 CSC codes. It includes the 2026-09-05 security patch. Samsung built it on 2026-09-15.

    SMR Sep-2026 fixes 80 vulnerabilities, 20 of them critical. Android Security Bulletin: 58, Samsung Semiconductor: 1, Samsung-specific issues (SVE): 21.

    No. A newer build for SM-S911U is available: S911USQU8GZIF. Install it instead of S911USQS8FZI1 unless you need this exact version. The previous build was S911USQS8FZH3.

    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 Samsung Galaxy S23 must be on bootloader binary 8 or lower.

    This build uses bootloader binary 8. It can be flashed on a Samsung Galaxy S23 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

    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.

    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.

    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...

    Show 3 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 8.0 (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...

    Model firmware by region