SM-R955N 6 countries Wear OS 6.0

Samsung Galaxy Watch6 Classic R955NKOS2CZE1 Firmware

Samsung Galaxy Watch6 Classic R955NKOS2CZE1 is an Wear OS 6.0 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 R955NKOU2CZB6: security patch 2026-05-05 instead of 2026-02-05. A newer build for SM-R955N is available: R955NKOS2CZF5.

8.7/10 (33)2,041 times
Wear OS 6.0
OS Version
2026-06-18
Build Date
2026-05-05
Security patch
6
Countries
10
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#.
    2
    MODEM/CP Version: R955NKOS2CZE1
    ModelRegionCSC VersionRelease dateSizeFile nameDownload
    SM-R955N
    KOO South Korea
    OKC, OSC, OUC
    		R955NOKO2CZE1 2026-06-18 3.457 GiB
    SM-R955N_3_20260618184923_o5w8kmnd3b_fac.zip
    SM-R955N
    KTC, KTO, LUC, SKC South Korea
    LUO, SKO
    		R955NOKA2CZE1 — 3.461 GiB
    SM-R955N_3_20260618185021_sphm3o43sh_fac.zip

    No matching downloads

    How to flash R955NKOS2CZE1

    • R955NKOS2CZE1 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.

    What's new in R955NKOS2CZE1

    • 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 patch: May 2026

    SMR May-2026 fixes 36 vulnerabilities, 2 of them critical. Android Security Bulletin: 29, Samsung-specific issues (SVE): 7.

    Most severe Samsung fixes:

    • high Improper input validation in FacAtFunction in Galaxy Watch prior to SMR May-2026 Release 1 allows local attacker to execute arbitrary code with system privilege. (CVE-2026-21019)

    All fixes and Galaxy models with this patch

    Rollout of R955NKOS2CZE1 by region

    Samsung released this build in all regions (3) on the same day, June 18, 2026.

    Frequently Asked Questions

    R955NKOS2CZE1 is Wear OS 6.0 firmware for Samsung Galaxy Watch6 Classic, released for 6 countries, 10 CSC codes. It includes the 2026-05-05 security patch. Samsung built it on 2026-06-18.

    SMR May-2026 fixes 36 vulnerabilities, 2 of them critical. Android Security Bulletin: 29, Samsung-specific issues (SVE): 7.

    No. A newer build for SM-R955N is available: R955NKOS2CZF5. Install it instead of R955NKOS2CZE1 unless you need this exact version. The previous build was R955NKOU2CZB6.

    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 Classic must be on bootloader binary 2 or lower.

    This build uses bootloader binary 2. It can be flashed on a Samsung Galaxy Watch6 Classic 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 Watch6 Classic

    • 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...

    • Security
    The device is protected with improved security.

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

    Show 6 older builds

    • 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.

    • Workout Tracker Support
    By connecting your Galaxy Watch to your Samsung TV, you can view workout data from your watch on your TV screen.
    ※ Supported products and connection requirements
    . Supports Samsung TV/Smart Monitor/Projector/Life Style products that are newly released from 2024. However, this may vary depending on Samsung policy.
    . It is supported on the condition that the same Samsung account is registered on both the Samsung TV and the Galaxy Watch.
    . For more information, please v...

    Model firmware by region