SM-L3550 1 country Wear OS 7.0

Samsung Watch9 44mm L3550ZCU1AZG1 Firmware

Samsung Watch9 44mm L3550ZCU1AZG1 is an Wear OS 7.0 firmware for China (CHC). It is the same firmware configured per region and carrier (CSC). Find your country below, verify the file and download for free. A newer build for SM-L3550 is available: L3550ZCS1AZH4.

8.7/10 (34)207 times
Wear OS 7.0
OS Version
2026-07-23
Build Date
2026-05-05
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: L3550ZCU1AZG1
    ModelRegionCSC VersionRelease dateSizeFile nameDownload
    SM-L3550
    CHC China
    		L3550CHC1AZG1 2026-07-07 3.259 GiB
    SM-L3550_1_20260723135011_7bktpmdchb_fac.zip

    No matching downloads

    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.

    What's new in L3550ZCU1AZG1

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

    How to flash L3550ZCU1AZG1

    • L3550ZCU1AZG1 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.

    Frequently Asked Questions

    L3550ZCU1AZG1 is Wear OS 7.0 firmware for Samsung Watch9 44mm, released for China (CHC). It includes the 2026-05-05 security patch. Samsung built it on 2026-07-23.

    No. A newer build for SM-L3550 is available: L3550ZCS1AZH4. Install it instead of L3550ZCU1AZG1 unless you need this exact version.

    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 3.259 GiB; keep about twice that free on the computer to unzip it. The Samsung Watch9 44mm must be on bootloader binary 1 or lower.

    This build uses bootloader binary 1. It can be flashed on a Samsung Watch9 44mm running binary 1 or lower; if the device already has a higher binary, Odin stops with "SW REV CHECK FAIL". 1 other build of this model uses the same binary, so you can switch between them in both directions.

    Other builds and changelog for Samsung Watch9 44mm

    • 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.

    Model firmware by region