SC-52B 1 country Android 15

Samsung Galaxy S21 Ultra 5G SC52BOMU1EZB1 Firmware

Samsung Galaxy S21 Ultra 5G SC52BOMU1EZB1 is an Android 15 firmware for Japan (DCM). 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 SC52BOMS1EYJ1, Android and the bootloader binary are unchanged, so you can switch between the two in both directions. This is the newest build for SC-52B.

Download firmware
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Android 15
OS Version
2026-03-13
Build Date
2025-09-01
Security patch
1
Countries
1
CSC codes
1
Bootloader binary

Bootloader binary 1. 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: SC52BOMU1EZB1
    ModelRegionCSC VersionRelease dateSizeFile nameDownload
    SC-52B
    DCM Japan
    		SC52BDCM1EZB1 2026-03-18 8.061 GiB
    SC-52B_5_20260213135621_pb5r559o7w_fac.zip
    		Download

    No matching downloads

    How to flash SC52BOMU1EZB1

    • SC52BOMU1EZB1 has bootloader binary 1. Your device must run binary 1 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 SC52BOMU1EZB1

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

    Security patch: September 2025

    SMR Sep-2025 fixes 70 vulnerabilities, 3 of them critical. Android Security Bulletin: 58, Samsung Semiconductor: 1, Samsung-specific issues (SVE): 11.

    Most severe Samsung fixes:

    • critical Out-of-bounds Write in libimagecodec.quram.so (CVE-2025-21043)
    • high Out-of-bounds write in libsavsvc.so (CVE-2025-21034)

    All fixes and Galaxy models with this patch

    Frequently Asked Questions

    SC52BOMU1EZB1 is Android 15 firmware for Samsung Galaxy S21 Ultra 5G, released for Japan (DCM). It includes the 2025-09-01 security patch. Samsung built it on 2026-03-13.

    SMR Sep-2025 fixes 70 vulnerabilities, 3 of them critical. Android Security Bulletin: 58, Samsung Semiconductor: 1, Samsung-specific issues (SVE): 11.

    Yes. SC52BOMU1EZB1 is the newest build for SC-52B on SamFirm. The previous build was SC52BOMS1EYJ1.

    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 8.061 GiB; keep about twice that free on the computer to unzip it. The Samsung Galaxy S21 Ultra 5G must be on bootloader binary 1 or lower.

    This build uses bootloader binary 1. It can be flashed on a Samsung Galaxy S21 Ultra 5G running binary 1 or lower; if the device already has a higher binary, Odin stops with "SW REV CHECK FAIL". 18 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

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

    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.

    One UI 6.1 Upgrade
    Circle to Search

    Instantly search for anything on your screen
    Circle to Search with Google lets you easily learn more about anything shown on your screen without switching apps. Just touch and hold the Home button or navigation handle, then circle anything on the screen to start a Google search.

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

    ＜note＞
    ・Please back up your data before updating.
    ・After the software is updated, downgrading to the previous version is not available.
    ・Please update the applications after the software is updated.
    ・Appcloud will be available after the software is upgraded.
    ・Refer to this link (https://www.docomo.ne.jp/support/manual/sc52b/) to find out more about operation changes after updating...

    Show 12 older builds

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

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

    ＜note＞
    ・Please back up your data before updating.
    ・After the software is updated, downgrading to the previous version is not available.
    ・Please update the applications after the software is updated.
    ・After the software is upgraded, Suguden will no longer be available.
    ・After the software is upgraded, Change Home Widget is removed from the widget list.
    　※You can continue to use th...

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

    ・Device stability improvements, bug fixes.
    ・New and / or enhanced features.
    ・Further improvements to performance.
    ・Improved security
    A new indicator on the top right of your status bar so you know when your app are accessing your microphone or camera are being accessed

    ＜note＞
    ・Please back up your data before updating.
    ・After the software is updated, downgrading to the previous version is not available.
    ・Please update the applications after the software is updated.

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

    Model firmware by region