Samsung Galaxy S21 Ultra 5G G998BXXSAFXCM
SM-G998B 24 countries Android 14

Samsung Galaxy S21 Ultra 5G G998BXXSAFXCM Firmware

Samsung Galaxy S21 Ultra 5G G998BXXSAFXCM is an Android 14 firmware for 24 countries, 28 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 G998BXXSAFXCL, Android and the bootloader binary are unchanged, so you can switch between the two in both directions. A newer build for SM-G998B is available: G998BXXUJHZF2.

OS updates guaranteed until: Android 15Security updates until: Jan 3, 2026
Download firmware
9.0/10 (481)84,183 times
Android 14
OS Version
2024-04-11
First release
other regions until 2024-04-15
2024-04-01
Security patch
24
Countries
28
CSC codes
A (10)
Bootloader binary

Bootloader binary A (10). Flashing firmware with a lower binary is usually blocked by Samsung anti-rollback.

Newer builds of Samsung Galaxy S21 Ultra 5G use bootloader binary J (19) (latest: G998BXXUJHZF2). If your device already runs binary J (19), this build cannot be flashed.

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#.
    Your CSC is in Settings → About phone (About tablet) → Software information, or dial *#1234#. The CSC sets your region's features and network bands. Download the firmware for your country.
    2
    MODEM/CP Version: G998BXXSAFXCM
    ModelRegionCSC VersionBuild DateRelease dateSizeFile nameDownload
    SM-G998B
    ACR Saudi Arabia
    AFR, DKR Kenya
    BKD Bangladesh
    BTU, VOD United Kingdom
    +17 more countries
    CAU, SKZ Kazakhstan
    ECT Nigeria
    GLB, XTC Philippines
    ILO Israel
    INU India
    MWD Morocco
    MYM Myanmar (Burma)
    NPL Nepal
    SEK Ukraine
    SER Russia
    SLK Sri Lanka
    THL Thailand
    TUR Turkey
    XFE South Africa
    XME Malaysia
    XNZ New Zealand
    CAL, ILP, SRR
    		G998BOXMAFXCM 2024-04-15 2024-04-12 8.157 GiB
    SM-G998B_4_20240402120530_794xynj9yi_fac.zip
    		Download
    SM-G998B
    XID Indonesia
    		G998BOLEAFXCM 2024-04-11 2024-04-12 7.167 GiB
    SM-G998B_4_20240402155300_qvem7v87dq_fac.zip
    		Download

    No matching downloads

    How to flash G998BXXSAFXCM

    • G998BXXSAFXCM has bootloader binary A (10). Your device must run binary A (10) 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 G998BXXSAFXCM

    • The security of your device has been improved.

    Security patch: April 2024

    SMR Apr-2024 fixes 35 vulnerabilities, 1 of them critical. Android Security Bulletin: 27, Samsung-specific issues (SVE): 8.

    Most severe Samsung fixes:

    • high Out-of-bounds write vulnerability in libsavsac.so (CVE-2024-20844)
    • high Out-of-bounds write vulnerability in libsavsac.so (CVE-2024-20845)
    • high Out-of-bounds Write vulnerability in libsdffextractor (CVE-2024-20849)

    All fixes and Galaxy models with this patch

    Rollout of G998BXXSAFXCM by region

    First release
    April 12, 2024
    Last region
    April 15, 2024
    Duration
    4 days
    Regions
    28
    1. Day 1 · · 13 regions
      IndonesiaXIDKazakhstanCAUSKZMalaysiaXMEMyanmar (Burma)MYMPhilippinesGLBXTCRussiaSERThailandTHLUkraineSEKUnited KingdomBTUVODCAL
    2. Day 4 · · 15 regions
      BangladeshBKDIndiaINUIsraelILOKenyaAFRDKRMoroccoMWDNepalNPLNew ZealandXNZNigeriaECTSaudi ArabiaACRSouth AfricaXFESri LankaSLKTurkeyTUR
      +1 more country
      ILPSRR

    Device specifications

    • Launched withAndroid 11
    • Display diagonal17.3 cm (6.8")
    • Display resolution3200 x 1440 pixels
    • Display typeDynamic AMOLED 2X
    • Processor frequency2.9 GHz
    • Processor familySamsung Exynos
    • RAM12 GB
    • Rear camera resolution108 MP
    • Rear camera typeQuad camera
    • SIM cardsDual SIM
    • Battery capacity5000 mAh
    • Weight228 g

    Frequently Asked Questions

    G998BXXSAFXCM is Android 14 firmware for Samsung Galaxy S21 Ultra 5G, released for 24 countries, 28 CSC codes. It includes the 2024-04-01 security patch. Samsung built it on 2024-04-11.

    SMR Apr-2024 fixes 35 vulnerabilities, 1 of them critical. Android Security Bulletin: 27, Samsung-specific issues (SVE): 8.

    No. A newer build for SM-G998B is available: G998BXXUJHZF2. Install it instead of G998BXXSAFXCM unless you need this exact version. The previous build was G998BXXSAFXCL.

    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 S21 Ultra 5G must be on bootloader binary A (10) or lower.

    This build uses bootloader binary A (10). It can be flashed on a Samsung Galaxy S21 Ultra 5G running binary A (10) or lower; if the device already has a higher binary, Odin stops with "SW REV CHECK FAIL". 7 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 S21 Ultra 5G

    • Stability and reliability
    Device behavior has been improved.

    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.

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

    • Security
    The device is protected with improved security.

    • The security of your device has been improved.

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    • 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.

    Model firmware by region