SM-R866U 1 country Wear OS 6

Samsung Galaxy Watch FE R866USQS1AYE9 Firmware

Samsung Galaxy Watch FE R866USQS1AYE9 is an Wear OS 6 firmware for United States (XAA). 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 R866USQU1AYD1: security patch 2025-05-01 instead of 2025-03-01. A newer build for SM-R866U is available: R866USQS2BZG3.

9.0/10 (34)304 times
Wear OS 6
OS Version
2025-06-16
Build Date
2025-05-01
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 Watch FE use bootloader binary 2 (latest: R866USQS2BZG3). 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: R866USQS1AYE9
    ModelRegionCSC VersionSizeFile nameDownload
    SM-R866U
    XAA United States
    		R866UOYM1AYE9 3.033 GiB
    SM-R866U_1_20250616173250_9d4fh20nme_fac.zip

    No matching downloads

    What's new in R866USQS1AYE9

    • Security
    The device is protected with improved security.

    How to flash R866USQS1AYE9

    • R866USQS1AYE9 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

    R866USQS1AYE9 is Wear OS 6 firmware for Samsung Galaxy Watch FE, released for United States (XAA). It includes the 2025-05-01 security patch. Samsung built it on 2025-06-16.

    No. A newer build for SM-R866U is available: R866USQS2BZG3. Install it instead of R866USQS1AYE9 unless you need this exact version. The previous build was R866USQU1AYD1.

    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 download is 3.033 GiB; keep about twice that free on the computer to unzip it. The Samsung Galaxy Watch FE must be on bootloader binary 1 or lower.

    This build uses bootloader binary 1. It can be flashed on a Samsung Galaxy Watch FE running binary 1 or lower; if the device already has a higher binary, Odin stops with "SW REV CHECK FAIL". 5 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 Watch FE

    • 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 4 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.

    • Security
    The device is protected with improved security.

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

    No changelog details available.
    Model firmware by region