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    Samsung Galaxy S21 Ultra (SM-G998B) - CAL - G998BXXUAGXDA firmware

    Samsung Galaxy S21 Ultra firmware G998BXXUAGXDA is the Android 14 build for the Samsung Galaxy S21 Ultra (model SM-G998B), released by Samsung for Thailand (CAL). It was built on 17 April 2024, carries the 2024-04-01 Android security patch, has changelist 28579955. The package combines system build G998BXXUAGXDA (AP/PDA) with CSC build G998BOXMAGXDA for the CAL region code. SamMobile added this file to the firmware archive on 9 May 2024.

    Country
    Model SM-G998B
    Product Code CAL
    Security Patch 2024-04-01
    OS Version Android 14
    PDA G998BXXUAGXDA
    CSC G998BOXMAGXDA
    Build Date 2024-04-17
    Changelist 28579955
    Join to Download Fast download

    G998BXXUAGXDA for other regions and carriers

    The same G998BXXUAGXDA build is also available for these SM-G998B regions:

    Other SM-G998B firmware for Thailand (CAL)

    All SM-G998B firmware for CAL · All Samsung Galaxy S21 Ultra (SM-G998B) firmware

    How to flash G998BXXUAGXDA on the Samsung Galaxy S21 Ultra (SM-G998B)

    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 (G998BXXUAGXDA) is the Android system build; its last three characters encode the year, month and revision. CSC (G998BOXMAGXDA) is the region and carrier configuration, and CP is the modem firmware. The product code CAL identifies the region or carrier this package was made for (Thailand). 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.