How To Install Android 4.1.2 Jelly Bean (XWLSJ) Official Firmware On Samsung Galaxy S2 GT-I9100

The Samsung Galaxy S2, with the model number GT-I9100, has received the Android 4.1.2 Jelly Bean (XWLSJ) official firmware update recently that comes with fixes for issues related to overheating, the Google Play Store app and other bugs.
Being an unbranded firmware, the new Android 4.1.2 Jelly Bean (XWLSJ) can be installed on any Samsung Galaxy S2 GT-I9100 version, except for China/ Taiwan regions, according to a Team Android report.

Apart from the bug fixes, the firmware update brings a lot of new features that include Touch Wiz Nature UX, S Cloud, new Lock Screen with many customizable options, new Galaxy S3 widgets, free 50 GB Dropbox Space, new Notification Bar with Notification Toggles and 2 Home Screen modes. The update also offers smooth performance and better stability, thanks to Project Butter.

Take a look at the firmware details below:

PDA: I9100XWLSJ
CSC: I9100OXXLS7
Version: 4.1.2

Those users, who are willing to update their Galaxy S2 to the Android 4.1.2 Jelly Bean (XWLSJ) official firmware, can download it from Samsung Kies. In case of any difficulties while updating, users can try out a manual installation procedure, explained below:

Users should know that the Jelly Bean firmware in question is an official firmware by Samsung, not a custom ROM. The users don’t need to use any custom recovery like ClockWorkMod to install Android 4.1.2 Jelly Bean (XWLSJ) on their device.

Users should also be aware of the fact that since the Android 4.1.2 Jelly Bean (XWLSJ) is an official firmware build, installing it will remove the root access on the device. Users will be required to root the Galaxy S2 once again.

Things To Do Before You Proceed

• Back up all the data in your Samsung Galaxy S2 GT-I9100
• Ensure that Galaxy S2 USB drivers are installed on the computer
• Enable USB debugging – Settings > Applications > Development > USB debugging (for Android 2.3 phones) or Settings > Developer options > USB debugging (for Android 4.0 phones)
• The device should have at least 80% of battery life
• Disable or uninstall all the security suites installed in the phone
• The process is meant only for Samsung Galaxy S2 (GT- I9100). The users must check their device's model number in: Settings > About Phone.

NOTE: Proceed at your own risk !

Procedure
Step 1: Download Android 4.1.2 (XWLSJ) for Samsung Galaxy S2 GT-I9100 and extract the zip file.

Step 2: Download Odin v3.07 and extract the file.

Step 3: Switch off the phone and put it on the Download Mode.To do this, press and hold the Volume Down and Home buttons while pressing the Power button until the Samsung Galaxy logo appears on the screen.

Step 4: Run Odin as an Administrator.

Step 5: Connect Galaxy S2 to your computer via the USB cable while in the Download mode.

Step 6: If the phone is connected properly, you will see that the ID: COM section turns Yellow. If not, check whether the USB drivers are installed properly in your computer.

You can also go to Settings > Wireless & Network > USB Settings and make sure that “Samsung KIES” option is ticked before connecting the phone to the computer.

Step 7: In Odin, click on PDA and select the .tar file with CODE in its name that you have got after extracting the XWLSJ Firmware Package in Step 1.

- 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. Use this file only if you get it while extracting the zip file mentioned in Step 1 or else just ignore it

Step 8: In the Odin, make sure that Auto Reboot and F. Reset Time checkboxes are selected. If you are using a .pit file, ensure that re-partition checkbox is selected.

Step 9: Click on the Start button in Odin to begin the installation process.

Step 10: After the installation is complete, the device will restart on its own. Once you get the Samsung logo on the home screen, unplug the device from the computer.

Additional Tips
If you want to confirm whether the phone is successfully updated to the new firmware, go to Settings > About Phone and check the firmware version.

In case the Galaxy S2 is not updated and gets into the boot loop mode, you will have to clear the cache from the Recovery mode and perform the entire process again.

To put the phone in the Recovery mode, first switch off your device. Then press the Volume Up + Menu Button and while holding both the buttons, turn on the device to enter in the Recovery mode. Once you are in the Recovery mode, select the option of “Wipe Data/ Factory Reset.”

[Source: Team Android]