SM-L355U 4 countries Wear OS 7.0

Samsung Galaxy Watch9 L355USQU1AZJ3 Firmware

Build Date:

Samsung Galaxy Watch9 L355USQU1AZJ3 is an Wear OS 7.0 firmware for 4 countries, 6 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 L355USQS1AZH4: security patch 2026-10-05 instead of 2026-08-05. This is the newest build for SM-L355U.

Download firmware
9.4 (18)1,576 times
Wear OS 7.0
OS Version
2026-11-11
Build Date
2026-10-05
Security patch
4
Countries
6
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: L355USQU1AZJ3
    ModelRegionCSC VersionRelease dateSizeFile nameDownload
    SM-L355U
    TMB, XAA, XAR United States
    DSA, DSG, FKR
    		L355UOYM1AZJ3 2026-11-11 3.557 GiB
    SM-L355U_1_20261111140000_upvpwjrn9h_fac.zip
    		Download

    No matching downloads

    How to flash L355USQU1AZJ3

    • L355USQU1AZJ3 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 L355USQU1AZJ3

    • 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 patch: October 2026

    SMR Oct-2026 fixes 62 vulnerabilities, 9 of them critical. Android Security Bulletin: 45, Samsung Semiconductor: 4, Samsung-specific issues (SVE): 13.

    Most severe Samsung fixes:

    • high Out-of-bounds write in libsmkvextractor.so prior to SMR Oct-2026 Release 1 allows local attackers to execute arbitrary code. (CVE-2026-21114)
    • high Use after free in WSM service prior to SMR Oct-2026 Release 1 allows local attackers to potentially execute arbitrary code with system privilege. (CVE-2026-21120)
    • high Out-of-bounds write in libsamsungtts.so prior to SMR Oct-2026 Release 1 allows local attackers to execute arbitrary code. (CVE-2026-21122)

    All fixes and Galaxy models with this patch

    Rollout of L355USQU1AZJ3 by region

    Samsung released this build in all regions (6) on the same day, November 11, 2026.

    Device specifications

    • Launched withWear OS
    • Display diagonal3.81 cm (1.5")
    • Display technologyAMOLED
    • Display resolution480 x 480 pixels
    • RAM2 MB
    • Battery capacity445 mAh
    • Weight34 g
    • Band colourGreen

    Specifications of SM-L355F, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.

    Frequently Asked Questions

    L355USQU1AZJ3 is Wear OS 7.0 firmware for Samsung Galaxy Watch9, released for 4 countries, 6 CSC codes. It includes the 2026-10-05 security patch. Samsung built it on 2026-11-11.

    SMR Oct-2026 fixes 62 vulnerabilities, 9 of them critical. Android Security Bulletin: 45, Samsung Semiconductor: 4, Samsung-specific issues (SVE): 13.

    Yes. L355USQU1AZJ3 is the newest build for SM-L355U on SamFirm. The previous build was L355USQS1AZH4.

    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 3.557 GiB; keep about twice that free on the computer to unzip it. The Samsung Galaxy Watch9 must be on bootloader binary 1 or lower.

    This build uses bootloader binary 1. It can be flashed on a Samsung Galaxy Watch9 running binary 1 or lower; if the device already has a higher binary, Odin stops with "SW REV CHECK FAIL". 2 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 Watch9

    • 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.

    No changelog details available.
    Model firmware by region

    New firmware for other devices

    All latest builds