SM-R945N 6 countries Wear OS 6

Samsung Galaxy Watch6 R945NKOS1BYH1 Firmware

Samsung Galaxy Watch6 R945NKOS1BYH1 is an Wear OS 6 firmware for 6 countries, 10 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 R945NKOU1BYD1: security patch 2025-08-01 instead of 2025-03-01. A newer build for SM-R945N is available: R945NKOS2CZF5.

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Wear OS 6
OS Version
2025-08-28
Build Date
2025-08-01
Security patch
6
Countries
10
CSC codes
1
Bootloader binary

Bootloader binary 1. Flashing firmware with a lower binary is usually blocked by Samsung anti-rollback.

Newer builds of Samsung Galaxy Watch6 use bootloader binary 2 (latest: R945NKOS2CZF5). If your device already runs binary 2, this build cannot be flashed.

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#.
    2
    MODEM/CP Version: R945NKOS1BYH1
    ModelRegionCSC VersionRelease dateSizeFile nameDownload
    SM-R945N
    KOO South Korea
    OKC, OSC, OUC
    		R945NOKO1BYH1 2025-08-28 3.402 GiB
    SM-R945N_2_20250828163921_9i36147day_fac.zip
    SM-R945N
    KTC, KTO, LUC, SKC South Korea
    LUO, SKO
    		R945NOKA1BYH1 — 3.407 GiB
    SM-R945N_2_20250828163751_hj7gvhlbgd_fac.zip

    No matching downloads

    Device specifications

    • Launched withWear OS
    • Battery capacity425 mAh
    • Weight33.3 g
    • Waterproof up to50 m
    • Band colourBlack

    Specifications of SM-R945F, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.

    What's new in R945NKOS1BYH1

    • Security
    The device is protected with improved security.

    These changes may vary depending on the model, country, or network operator of the customer environment.

    How to flash R945NKOS1BYH1

    • R945NKOS1BYH1 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

    R945NKOS1BYH1 is Wear OS 6 firmware for Samsung Galaxy Watch6, released for 6 countries, 10 CSC codes. It includes the 2025-08-01 security patch. Samsung built it on 2025-08-28.

    No. A newer build for SM-R945N is available: R945NKOS2CZF5. Install it instead of R945NKOS1BYH1 unless you need this exact version. The previous build was R945NKOU1BYD1.

    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 Watch6 must be on bootloader binary 1 or lower.

    This build uses bootloader binary 1. It can be flashed on a Samsung Galaxy Watch6 running binary 1 or lower; if the device already has a higher binary, Odin stops with "SW REV CHECK FAIL". 7 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 Watch6

    • Security
    The device is protected with improved security.

    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.

    • Stability and reliability
    Device behavior has been improved.
    • Security
    The device is protected with improved security.

    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.

    One UI 8 Watch Upgrade
    Get things done

    Stay on top of important tasks with the Now bar
    Check the information you need right now and start essential features straight from your watch face. Ongoing tasks will appear in the Now bar at the bottom of your watch face so you can check key information quickly.

    Do more with double pinch
    Just pinch your thumb and index finger together twice to scroll through notifications, control music, take pictures, and more. You can also customize what happens wh...

    Show 6 older builds

    • Security
    The device is protected with improved security.

    These changes may vary depending on the model, country, or network operator of the customer environment.

    • Stability and reliability
    The stability has been improved.
    • Security
    The device is protected with improved security.

    • Stability and reliability
    The stability has been improved.

    One UI 6 Watch Upgrade
    A new look for your watch

    Discover new watch faces
    Express your individual style with these new premium watch faces. Spatial Number provides an analog clock on top of large bold digits. Simple Digital is for people who prefer a minimalist design. Ultra Info Board lets you quickly check your workout information. You can find these watch faces in the new featured watch faces section of the Galaxy Wearable app. You can also browse watch faces by keyword including colors,...

    • Stability and reliability
    The stability has been improved.

    • Stability and reliability
    Stabilization codes for touch-screen operation have been applied.

    Model firmware by region