After SGS2 I9100 & I9100T received the Jelly Bean update, now the Samsung Galaxy S2 I9100GJPLA2 update has become available for download. You can download the firmware and can install it on your device using Odin. The update is dated January 28th and was released for Mauritania region. Here are more details about the firmware and the download link:
Download & Install Galaxy S2 I9100 GJPLA2 Update
Here’s the direct download link: I9100GJPLA2_I9100GOJPLA3_MRT.zip
After downloading, you can flash this firmware on your Galaxy SII I9100G device. It can be installed using Odin. For a complete step by step guide head over to out Odin tutorial: How to flash stock ROM using Odin.
If you are familiar with Odin and have used it to flash the ROM in the past, you can simply follow these steps mentioned here briefly:
Step 1: Extract the downloaded zip file. You will get a .tar.md5 file.
Step 2: Download and extract Odin: Odin3_v3.04.zip. Then launch the Odin app.
Step 3: Put your device in download mode and connect it to the computer.
Step 4: In Odin, click on “Start” button.
This will install the ROM on your device.