SM-R855N 6 countries Tizen 5.5.0.2

Samsung Galaxy Watch3 41mm R855NKOU1BUK2 Firmware

Samsung Galaxy Watch3 41mm R855NKOU1BUK2 is an Tizen 5.5.0.2 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 R855NKOU1BUD1, Android and the bootloader binary are unchanged, so you can switch between the two in both directions. A newer build for SM-R855N is available: R855NKOU1BWK2.

9.4/10 (27)1,623 times
Tizen 5.5.0.2
OS Version
2021-11-18
Build Date
n/a
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.

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: R855NKOU1BUK2
    ModelRegionCSC VersionRelease dateSizeFile nameDownload
    SM-R855N
    KOO South Korea
    OKC, OSC, OUC
    		R855NOKO1BUK2 2021-11-22 754.655 MiB
    SM-R855N_1_20211118180431_ssgu0v2s08_fac.zip
    SM-R855N
    KTC, KTO, LUC, SKC South Korea
    LUO, SKO
    		R855NOKA1BUK2 — 757.63 MiB
    SM-R855N_1_20211118184501_no0hsz6lnj_fac.zip

    No matching downloads

    Device specifications

    • Display diagonal3.05 cm (1.2")
    • Display technologyOLED
    • Display resolution360 x 360 pixels
    • RAM1024 MB
    • Flash memory8 GB
    • Battery capacity247 mAh
    • Weight48.2 g
    • Band materialLeather
    • Band colourBlack

    Specifications of SM-R855F, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.

    What's new in R855NKOU1BUK2

    • Watch faces
    - Support the new Watchfaces
    • Exercise
    - Support Group Challenge Widget in watch
    - Provide more accurate calorie consumption levels based on HR (Except swimming)
    • Detect falls
    - More falls will be detected, but other activity may also be detected as falls.
    • Calendar
    - Increase the calendar synchronization period from 3 months to 1 year

    How to flash R855NKOU1BUK2

    • R855NKOU1BUK2 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

    R855NKOU1BUK2 is Tizen 5.5.0.2 firmware for Samsung Galaxy Watch3 41mm, released for 6 countries, 10 CSC codes. Samsung built it on 2021-11-18.

    No. A newer build for SM-R855N is available: R855NKOU1BWK2. Install it instead of R855NKOU1BUK2 unless you need this exact version. The previous build was R855NKOU1BUD1.

    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 Watch3 41mm must be on bootloader binary 1 or lower.

    This build uses bootloader binary 1. It can be flashed on a Samsung Galaxy Watch3 41mm running binary 1 or lower; if the device already has a higher binary, Odin stops with "SW REV CHECK FAIL". 9 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 Watch3 41mm

    • Watch faces
    2 new types of new Watch faces.
    (Stretched Time, Perpetual)
    • Stability and reliability
    The stability for sensors has been improved.

    • Watch Face
    Enjoy new and improved watch faces with enriched style and customizable options.
    - Two new Watch Faces have been added.
      (Pro analog, Gradient number)
    • Samsung Health
    - Through the updated 'Daily Activity Indicator', Mobile Health data is synchronized to improve convenience.
    - Provides a recording function when snoring is detected, using your mobile phone while you sleep.

    • GPS
    The stability has been improved.

    • Watch faces
    - Support the new Watchfaces
    • Exercise
    - Support Group Challenge Widget in watch
    - Provide more accurate calorie consumption levels based on HR (Except swimming)
    • Detect falls
    - More falls will be detected, but other activity may also be detected as falls.
    • Calendar
    - Increase the calendar synchronization period from 3 months to 1 year

    • Improved Messaging App stability  
    • Improved WiFi stability  
    • Improved system stability and reliability

    Show 5 older builds

    • Improved Samsung Health Function
    - You can now enjoy a group-walking challenge with your friends
    - Reduced auto workout recognition time (running, rowing machine, elliptical)
    - Enjoy home workout with a variety of fitness programs
    • SmartThings Find
    - You can find the location of the watch on the map.
    - Available on Galaxy smartphones with Android 8.0 and later
    • Hand Wash
    - After downloading the Hand Wash app, your watch can automatically detect and time, when you start washing your han...

    • Voice guidance provided via headset connected to mobile when exercising with a watch.
    • Voice guidance provided for traveled distance and HR data, when Auto Lap feature is enabled during Running/Cycling.
    • Improved Blood Oxygen measurement
    • Improved system stability and reliability

    • Improved system reliability
    No changelog details available.
    No changelog details available.
    Model firmware by region