Samsung Galaxy Watch4 R860ZCU1IYCD
SM-R860 1 country Wear OS 6

Samsung Galaxy Watch4 R860ZCU1IYCD Firmware

Samsung Galaxy Watch4 R860ZCU1IYCD is an Wear OS 6 firmware for China (CHC). 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 R860ZCU1IXK2: security patch 2025-03-01 instead of 2024-10-01. A newer build for SM-R860 is available: R860TBS2JZG3.

Download firmware
9.0/10 (29)374 times
Wear OS 6
OS Version
2025-04-09
First release
other regions until 2025-04-14
2025-03-01
Security patch
1
Countries
1
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 Watch4 use bootloader binary 2 (latest: R860TBS2JZG3). 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#.
    MODEM/CP Version: R860ZCU1IYCD
    ModelRegionCSC VersionBuild DateRelease dateSizeFile nameDownload
    SM-R860
    CHC China
    		R860ZMK1IYCD 2025-04-14 2025-04-09 2.947 GiB
    SM-R860_22_20250414115041_fkqo424z2w_fac.zip
    SM-R860
    CHC China
    		R860CHC1IYCD 2025-04-09 2025-04-09 2.944 GiB
    SM-R860_2_20250409162310_latau8r4dp_fac.zip

    No matching downloads

    How to flash R860ZCU1IYCD

    • R860ZCU1IYCD 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.

    What's new in R860ZCU1IYCD

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

    Security patch: March 2025

    SMR Mar-2025 fixes 55 vulnerabilities, 11 of them critical. Android Security Bulletin: 49, Samsung-specific issues (SVE): 6.

    Most severe Samsung fixes:

    • high Improper access control in SecSettingsIntelligence (CVE-2025-20903)

    All fixes and Galaxy models with this patch

    Device specifications

    • Launched withWear OS
    • Display diagonal3.05 cm (1.2")
    • Display technologyOLED
    • Display resolution396 x 396 pixels
    • Processor frequency1.8 MHz
    • RAM1500 MB
    • Flash memory16 GB
    • Battery capacity247 mAh
    • Weight25.9 g
    • Band materialSilicone
    • Band colourBlack

    Frequently Asked Questions

    R860ZCU1IYCD is Wear OS 6 firmware for Samsung Galaxy Watch4, released for China (CHC). It includes the 2025-03-01 security patch. Samsung built it on 2025-04-09.

    SMR Mar-2025 fixes 55 vulnerabilities, 11 of them critical. Android Security Bulletin: 49, Samsung-specific issues (SVE): 6.

    No. A newer build for SM-R860 is available: R860TBS2JZG3. Install it instead of R860ZCU1IYCD unless you need this exact version. The previous build was R860ZCU1IXK2.

    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 Watch4 must be on bootloader binary 1 or lower.

    This build uses bootloader binary 1. It can be flashed on a Samsung Galaxy Watch4 running binary 1 or lower; if the device already has a higher binary, Odin stops with "SW REV CHECK FAIL". 29 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 Watch4

    • Security
    The device is protected with improved security.

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

    No changelog details available.

    • Security
    The device is protected with improved security.

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

    No changelog details available.

    • 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.

    Show 10 older builds

    • Stability and reliability
    Device behavior has been improved.

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

    No changelog details available.

    • Stability and reliability
    Device behavior has been improved.

    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.

    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...

    • Stability and reliability
    Device behavior has been improved.

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

    Model firmware by region