Samsung Galaxy S21 Ultra 5G G998U1UESHHYI2
SM-G998U1 7 countries Android 15

Samsung Galaxy S21 Ultra 5G G998U1UESHHYI2 Firmware

Samsung Galaxy S21 Ultra 5G G998U1UESHHYI2 is an Android 15 firmware for 7 countries, 20 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 G998U1UESGHYF1: bootloader binary raised from G (16) to H (17), so after installing it there is no way back to older builds; security patch 2025-09-01 instead of 2025-06-01. A newer build for SM-G998U1 is available: G998U1UESJHZB1.

OS updates guaranteed until: Android 15Security updates until: Jan 23, 2026
8.7/10 (211)27,346 times
Android 15
OS Version
2025-09-29
First release
other regions until 2025-09-30
2025-09-01
Security patch
7
Countries
20
CSC codes
H (17)
Bootloader binary

Bootloader binary H (17). 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: G998U1UESJHZB1). 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: G998U1UESHHYI2
    ModelRegionCSC VersionBuild DateRelease dateSizeFile nameDownload
    SM-G998U1
    ACG, AIO, ATT, CCT, LRA, SPR, TFN, TMB, TMK, USC, VZW, XAA, XAR, XAS United States
    ATC, CHA, DSH, FKR, XAG
    		G998U1OYMHHYI2 2025-09-29 2025-09-29 7.878 GiB
    SM-G998U1_5_20250909143301_s8zzsntrie_fac.zip
    SM-G998U1
    PCT Puerto Rico
    		G998U1OWAHHYI2 2025-09-30 2025-09-30 7.773 GiB
    SM-G998U1_5_20250912064941_of9eqyojdz_fac.zip

    No matching downloads

    Device specifications

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

    Specifications of SM-G998, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.

    What's new in G998U1UESHHYI2

    • Security
    The device is protected with improved security.

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

    How to flash G998U1UESHHYI2

    • G998U1UESHHYI2 has bootloader binary H (17). Your device must run binary H (17) 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

    G998U1UESHHYI2 is Android 15 firmware for Samsung Galaxy S21 Ultra 5G, released for 7 countries, 20 CSC codes. It includes the 2025-09-01 security patch. Samsung built it on 2025-09-29.

    No. A newer build for SM-G998U1 is available: G998U1UESJHZB1. Install it instead of G998U1UESHHYI2 unless you need this exact version. The previous build was G998U1UESGHYF1.

    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 H (17) or lower.

    This build uses bootloader binary H (17). It can be flashed on a Samsung Galaxy S21 Ultra 5G running binary H (17) or lower; if the device already has a higher binary, Odin stops with "SW REV CHECK FAIL". No other build of this model uses binary H (17).

    Other builds and changelog for Samsung Galaxy S21 Ultra 5G

    • 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.

    Show 15 older builds

    • The security of your device has been improved.

    One UI 7.0 Upgrade (Android 15)
    Bold new look

    Visual enhancements
    Enjoy a more sophisticated and unique look. One UI 7 introduces a stunning redesign to key components including buttons, menus, notifications and control bars, providing a more consistent visual experience with curves and circles. Beautiful new colors, soft animations, and an innovative blur effect that's unique to One UI make information hierarchy clearer and help you focus on important information.

    Reimagined Home screen
    Fr...

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

    • 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.

    • 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.

    • 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.

    Model firmware by region