How to Install XXLSJ Android 4.1.2 Jelly Bean on Galaxy S2 I9100

How to Install XXLSJ Android 4.1.2 Jelly Bean on Galaxy S2 I9100

We have put together a detailed step-by-step instructions guide on how to update Samsung Galaxy S II to XXLSJ Android 4.1.2 Jelly Bean. If you are used to installing official updates through ODIN on Samsung Galaxy devices, then this should not be any different for you.
Please read every line carefully and make sure you read the entire tutorial once before actually performing it on your phone.

To Remember:

• This Android 4.1.2 XXLSJ tutorial is only for Samsung Galaxy S2 I9100. Please don’t try this on any other variants of the phone.
• This is a pre-release test firmware leaked online, not an official update or full firmware by Samsung.
• Make sure you backup all your data in your phone before proceeding.

Rooting Warning: This is an official Android 4.1.2 build XXLSJ update for Galaxy S II I9100, which means you will lose root as soon as you install this update. You will again have to root Galaxy S2 to gain full system access and be able to install root apps again. See here: How to Root XXLSJ Android 4.1.2 on Galaxy S2 I9100.
Complete Step-By-Step Instructions:
Step 1 - Download Android 4.1.2 I9100XXLSJ for Galaxy S2 to your computer and extract the zip file.
Step 2 - Download ODIN v1.85 which will help you to install Android 4.1.2 on Samsung Galaxy S2 I9100.
Step 3 - Switch OFF your phone. Now go to Download Mode. How? Press and hold the Volume Down + Home buttons together, and then press the Power button till you see the construction Android robot and a triangle. Press Power again to confirm to enter into Download Mode.
Step 4 - Make sure you have your Galaxy S2 USB drivers installed on your computer.
Step 5 - Open ODIN on your computer. Connect your phone to your computer while your phone is in the Download Mode.
Step 6 - If your phone is connected successfully, one of the ID:COM boxes will turn yellow with the COM port number. This step might take some time.
Step 7 - Now select the files that you have to flash/install on your phone. These files are to be found from the extracted files in Step 1.

• Click on ‘PDA’ and select file with ‘CODE’ or ‘HOME’ in its name.
• Click on ‘Phone’ and select file with ‘MODEM’ in its name. Ignore this step if there is no such file.
• Click on ‘CSC’ and select file with CSC’ in its name. Ignore this step if there is no such file.
• Click on ‘PIT’ and select the .pit file. Ignore this step if there is no such file.

Step 8 - In ODIN, check the Auto Reboot and F. Reset Time options. As for the Re-Partition option, check it ONLY if you selected a .PIT file in the above step.
Step 9 - Now click on the Start button in ODIN. Installation process will start and would take a few minutes to complete.
Step 10 - After the installation is completed, your phone will restart. After you see the home screen, unplug your phone from the computer.
That’s it. Your Samsung Galaxy S II has now been updated to Android 4.1.2 build XXLSJ software update. Go to Settings > About phone to verify what build have you installed.
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