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    Samsung Galaxy Watch5 40mm (SM-R905F) - ATO - R905FXXU1DYK4 firmware

    Samsung Galaxy Watch5 40mm firmware R905FXXU1DYK4 is the Android 16 build for the Samsung Galaxy Watch5 40mm (model SM-R905F), released by Samsung for Open Austria (ATO). It was built on 12 November 2025, carries the 2025-10-01 Android security patch, has changelist 32155332. The package combines system build R905FXXU1DYK4 (AP/PDA) with CSC build R905FOXA1DYK4 for the ATO region code. The download is 3.4 GB and has MD5 checksum 35a390b8f5562637fb82c375815233ce, so you can verify the file after downloading. SamMobile added this file to the firmware archive on 18 September 2026.

    Country
    Model SM-R905F
    Product Code ATO
    Security Patch 2025-10-01
    OS Version Android 16
    PDA R905FXXU1DYK4
    CSC R905FOXA1DYK4
    Build Date 2025-11-12
    Changelist 32155332
    File size 3.4 GB (3,696,120,285 bytes)
    MD5 35a390b8f5562637fb82c375815233ce
    Join to Download Fast download

    How to flash R905FXXU1DYK4 on the Samsung Galaxy Watch5 40mm (SM-R905F)

    We recommend updating through Samsung's own tools: over-the-air (Settings › Software update) or Samsung Smart Switch on a PC. Flash the full firmware with Odin only when you are sure about the risks. A wrong region or a failed flash can brick the device, and SamMobile is not responsible for any damage.

    1. Download the firmware package above and extract the ZIP. It contains the AP (PDA), BL, CP and CSC files, plus a HOME_CSC file.
    2. Download and extract Odin on a Windows PC, and install the Samsung USB drivers if the PC does not detect the phone.
    3. Switch the device off and boot it into Download mode (usually Volume Up + Volume Down while connecting the USB cable, or Volume Down + Bixby + Power on older models).
    4. Open Odin. The ID:COM box turns blue when the device is connected.
    5. Load the files in their slots: BL, AP, CP and CSC. Use HOME_CSC to keep your apps and data, CSC to wipe the device.
    6. Leave Re-Partition unticked and click Start. The device reboots when Odin shows PASS. The first boot after a flash can take a few minutes.

    Step-by-step PDFs: 5-file firmware and 1-file firmware.

    What the build numbers mean

    PDA / AP (R905FXXU1DYK4) is the Android system build; its last three characters encode the year, month and revision. CSC (R905FOXA1DYK4) is the region and carrier configuration, and CP is the modem firmware. The product code ATO identifies the region or carrier this package was made for (Open Austria); our list of Samsung CSC codes maps every code to its country and carrier. Flashing a package for a different product code changes carrier features and can be refused by the bootloader, so pick the one that matches the CSC shown under Settings › About phone › Software information.