Samsung has rolled out its first Android 4.1.2 Jelly Bean Over-The-Air (OTA) update with build number XXUAMF1 for Galaxy S2 GT-I9120 (LTE) users in Sweden. The new update is expected to be released for other European countries in phases, while the firmware can be currently downloaded through Samsung KIES in select countries.

Those who missed the official OTA update notification and those who cannot wait for the official firmware release in their country can still install the same manually, using our step-by-step guide. The installation of this firmware does not require any custom recovery tool such as ClockworkMod (CWM) or TWRP, as it installs via ODIN flash tool.

Key Points to Note

  • Android 4.1.2 XXUAMF1 Jelly Bean firmware and the instructions are meant for the Galaxy S2 (LTE) GT-I9120 model only. Do not attempt installing this firmware on another variant or device, as it may inadvertently hard-brick or damage the device. Verify the device model number by navigating to Settings > About Phone.
  • Back up data and settings via a recommended custom recovery tool such as ClockworkMod (CWM) or TWRP
  • Verify appropriate USB drivers are installed for the device on computer (download Galaxy S2 GT-I9120 LTE USB drivers)
  • Ensure USB debugging mode is enabled on tablet by navigating to Settings > Developer Options (if device is running Android 4.0 or later) or Settings > Applications > Development (if device is running Android 2.3 or earlier).
  • Ensure phone has at least 80% battery charge to prevent unexpected device shutdown (due to battery drain) while installing ROM.
  • Ensure both device and its bootloader is unlocked.
  • After firmware installation, if device is stuck at booting or experiences boot loop issues, Wipe Cache Partition and Wipe Dalvik Cache a few more times before rebooting.
  • Allow newly installed ROM to stabilise for five minutes before using the device.
  • If a Status 7 error message flashes while installing firmware, it could be due to an incompatible device or absence of a necessary kernel (for instance, a Jelly Bean Kernel must be installed before installing any Jelly Bean ROM).
  • Instructions provided in this guide are meant for reference purpose only. IBTimes UK will not be held liable if the device is damaged or bricked during or after firmware installation. Users are advised to proceed with caution and follow the instructions carefully.

How to Install Android 4.1.2 XXUAMF1 Jelly Bean Official Firmware on Galaxy S2 (LTE) GT-I9120

Step 1: Download Android 4.1.2 I9120XXUAMF1 Jelly Bean OTA for Galaxy S2 (LTE) GT-I9120 and Odin v3.07 on your computer.

Step 2: Extract the firmware zip file to the desktop to obtain a .tar.md5 file and some other files (optional).

Step 3: Extract Odin zip file to get Odin3 v3.07.exe as well as few other files.

Step 4: Power off the phone and wait for vibration (about 5-6 seconds) to confirm complete device shutdown. Then boot the device into Download Mode by pressing and holding Volume Down, Home and Power buttons together until a construction Android robot icon with a warning triangle appears on screen. Then hit Volume Up button to progress into Download Mode.

Step 5: Launch Odin3 v3.07.exe that you extracted in Step 3 as an Administrator, as Admin privileges are required to complete the installation process smoothly.

Step 6: Connect the Galaxy S2 to computer via USB cable, while the device is still in Download mode. When the device connects successfully, a message saying "Added!" appears in ODIN and the ID: COM box will turn yellow or blue with the corresponding COM port number. If the message fails to appear, try reinstalling the phone's USB drivers or changing the port on computer.

Step 6: Choose the following files from the extracted I9120XXUAMF1 firmware folder obtained in Step 1 by using respective checkboxes:

  • Select the PDA checkbox, and click the '.tar.md5' file
  • Tap the Phone checkbox, and select the file named 'modem' (ignore if such file is not found)
  • Choose the CSC checkbox, and click the file named 'CSC' (ignore if there is no such file)
  • Click the PIT checkbox, and choose the '.pit' file (ignore if the file is missing)

Step 7: In Odin, enable Auto Reboot and F. Reset Time options by selecting the checkboxes. But the Re-Partition checkbox must be selected only if a .pit file was chosen in previous step.

Step 8: To prevent ROM related errors, verify Step 6 and Step 7 are done correctly. Then hit START button to begin flashing firmware.

Step 9: Once the firmware installation is complete, the phone will reboot automatically and soon a PASS message with green background appears in the left-most box at the very top of Odin. Now it is safe to unplug the USB cable to disconnect the device from computer.

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[Source: Android Jinn]