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

News for Samsung Galaxy S2 Users now you can update your Galaxy S2 (GT-I9100) with Android 4.1.2 Jelly Bean, as a new official firmware released in some countries according to us users from many countries able to install it, but China/ Taiwan region’s users avoid it. This official firmware update also helpful to fix issues like overheating, the Google Play Store app and other bugs.


Firmware details below:



Version: 4.1.2

As it is an unbranded firmware it can be safe to use in Samsung Galaxy S2 GT-I9100 version mainly. This update brings not only bugs fixes but also many other new features like 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. And also gifted the S2 with smart look, smooth performance and better stability and power.

Samsung Galaxy S2 is one of the top most sold product of Samsung and also one of most sold smartphone compare to any other smartphone worldwide. So there must be so many users are waiting to get this new Jelly Bean update for their S2, those who want to update their smartphone can download it from Samsung Kies or users can apply manual installation as described below:

These days users are asking questions about is this update is official firmware or just another custom ROM. There is no need to install any custom recovery software to install Android 4.1.2 Jelly Bean (XWLSJ) on their device. There is also a awareness about this update that installing it will remove the root access on the device. After this users have to root the Galaxy S2 once again.

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Things To Do Before You Update:

– Back up all the data in your Samsung Galaxy S2 GT-I9100 including media files.

– Make sure that Galaxy S2 USB drivers are installed on the system.

– Enable USB debugging – Settings > Developer options > USB debugging (for Android 4.0 phones)

– The phone should have at least 80% of battery charged.

– Disable or uninstall all security suites if installed.

– 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: OnlineTechGuru cannot be held responsible for anything that goes wrong. Users should proceed at their own risk.

Steps to follow for the Updating Firmware:

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.

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

(If you won’t find all these files in your setup then it doesn’t mean setup is incomplete, so don’t get confused and just keep following the further steps)

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.

At last you can confirm about the update of your smartphone, 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 using power button to enter into the Recovery mode. Once you are into Recovery mode, select the option of “Wipe Data/ Factory Reset”.

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