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    Samsung GALAXY S II (SGH-I727) - ATT - I727UCMC1 firmware

    Samsung GALAXY S II firmware I727UCMC1 is the Android 4.1.2 build for the Samsung GALAXY S II (model SGH-I727), released by Samsung for USA (AT&T) (ATT). It was built on 13 March 2013, has changelist 844945. The package combines system build I727UCMC1 (AP/PDA) with CSC build I727ATTMC1 for the ATT region code. The download is 463 MB and has MD5 checksum 4f1cd6d27dee4e021f3e896c13f69573, so you can verify the file after downloading. SamMobile added this file to the firmware archive on 14 March 2013.

    Country
    Model SGH-I727
    Product Code ATT
    Security Patch
    OS Version Android 4.1.2
    PDA I727UCMC1
    CSC I727ATTMC1
    Build Date 2013-03-13
    Changelist 844945
    File size 463 MB (485,902,372 bytes)
    MD5 4f1cd6d27dee4e021f3e896c13f69573
    Join to Download Fast download

    I727UCMC1 for other regions and carriers

    The same I727UCMC1 build is also available for these SGH-I727 regions:

    All SGH-I727 firmware for ATT · All Samsung GALAXY S II (SGH-I727) firmware

    How to flash I727UCMC1 on the Samsung GALAXY S II (SGH-I727)

    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 (I727UCMC1) is the Android system build; its last three characters encode the year, month and revision. CSC (I727ATTMC1) is the region and carrier configuration, and CP is the modem firmware. The product code ATT identifies the region or carrier this package was made for ( USA (AT&T)); 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.