SM-R905N 3 countries Android 16

Samsung Galaxy Watch5 R905NKOU2DZB6 Firmware

Samsung Galaxy Watch5 R905NKOU2DZB6 is an Android 16 firmware for LUO, SKO, South Korea (KOO, KTC, KTO, 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 R905NKOU1DYL6: bootloader binary raised from 1 to 2, so after installing it there is no way back to older builds. A newer build for SM-R905N is available: R905NKOS2DZG3.

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Android 16
OS Version
2026-03-17
Build Date
n/a
Security patch
3
Countries
7
CSC codes
2
Bootloader binary

Bootloader binary 2. 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: R905NKOU2DZB6
    ModelRegionCSC VersionBuild DateSizeFile nameDownload
    SM-R905N
    KOO South Korea
    		R905NOKO2DZB6 — 3.266 GiB
    SM-R905N_4_20260317103930_ab72vj1crk_fac.zip
    SM-R905N
    KTC, KTO, LUC, SKC South Korea
    LUO, SKO
    		R905NOKA2DZB6 2026-03-17 3.275 GiB
    SM-R905N_4_20260317103901_5xfr1qnkqd_fac.zip

    No matching downloads

    How to flash R905NKOU2DZB6

    • R905NKOU2DZB6 has bootloader binary 2. Your device must run binary 2 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 diagonal3.05 cm (1.2")
    • Display technologyOLED
    • Display resolution396 x 396 pixels
    • RAM1500 MB
    • Flash memory16 GB
    • Battery capacity284 mAh
    • Weight28.7 g
    • Waterproof up to50 m
    • Band colourPink gold

    Specifications of SM-R905F, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.

    Frequently Asked Questions

    R905NKOU2DZB6 is Android 16 firmware for Samsung Galaxy Watch5, released for LUO, SKO, South Korea (KOO, KTC, KTO, LUC, SKC). Samsung built it on 2026-03-17.

    No. A newer build for SM-R905N is available: R905NKOS2DZG3. Install it instead of R905NKOU2DZB6 unless you need this exact version. The previous build was R905NKOU1DYL6.

    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 Watch5 must be on bootloader binary 2 or lower.

    This build uses bootloader binary 2. It can be flashed on a Samsung Galaxy Watch5 running binary 2 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 Watch5

    No changelog details available.
    Model firmware by region