Installing Android 4.1.2 Official ROM (XWLSU) On Galaxy S2

While Samsung has been pretty good about releasing OTA updates for the Galaxy S2, these can be problematic for many users due to region restrictions. Orange subscribers looking to load the official Android 4.1.2 XWLSU build onto their S2 will find the following guide useful.

As always, DroidReport assumes no liability for the firmware installation. Proceed with caution.

Before Getting Started

Before you get started, make sure that your Galaxy S2 is the factory unlocked GT-I9100 model.

As always, you want to backup your device since the firmware installation will likely wipe out all your data. Additionally, the installation will remove any custom ROM installed to your device.

Charge your S2 to at least 80 percent before proceeding.

Ensure that you have up-to-date USB drivers installed and connect your Galaxy S2 to your computer. Finally, enable USB Debugging mode by navigating to Settings -> Developer Options.

Updating Samsung Galaxy S2 (GT-I9100) to Android 4.1.2 Jelly Bean

1) Download and extract the official Android 4.1.2 firmware for your region: Poland, Spain, France, Austria or Romania.

2) Download and extract Odin, which is available here.

3) Launch Odin.

4) Boot your Galaxy S2 into Download mode by pressing the Volume Down and Power buttons together until a warning prompt appears. Once you see the prompt, press Volume Up to enter download mode.

5) Right click on Odin and launch the application as an administrator.

6) Using Odin, install the following files from the .zip archive downloaded earlier:

    A) Click PDA and select the .tar.md5 file.

    B) Select Phone and navigate to the file with Modem in the file path.

    C) Click CSC and select the file with CSC in the file path.

    D) Click PIT and select the file with .pit in the file path.

7) Navigate to the Option submenu in Odin and check Auto Reboot and F.Reset Time. Uncheck Re-Partition.

8) Click Start and the installation will begin.

9) When the firmware has finished flashing to your Galaxy S2, your phone will automatically reboot.

10) Once your Galaxy S2 restarts, you will officially be running Android 4.1.2 Jelly Bean. Kudos.