SM-L355N 1 country Android 17

Samsung Watch9 44mm L355NKOS1AZH4 Firmware

Samsung Watch9 44mm L355NKOS1AZH4 is an Android 17 firmware for South Korea (KOO, KTC, LUC, SKC). 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 L355NKOU1AZFL, Android and the bootloader binary are unchanged, so you can switch between the two in both directions. This is the newest build for SM-L355N.

9.4/10 (32)841 times
Android 17
OS Version
2026-08-31
Build Date
n/a
Security patch
1
Countries
4
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: L355NKOS1AZH4
    ModelRegionCSC VersionSizeFile nameDownload
    SM-L355N
    KOO, KTC, LUC, SKC South Korea
    		L355NOKR1AZH4 3.57 GiB
    SM-L355N_1_20260831190150_iehowdmy1l_fac.zip

    No matching downloads

    How to flash L355NKOS1AZH4

    • L355NKOS1AZH4 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.

    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

    L355NKOS1AZH4 is Android 17 firmware for Samsung Watch9 44mm, released for South Korea (KOO, KTC, LUC, SKC). Samsung built it on 2026-08-31.

    Yes. L355NKOS1AZH4 is the newest build for SM-L355N on SamFirm. The previous build was L355NKOU1AZFL.

    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 3.57 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

    No changelog details available.
    Model firmware by region