Last time when we checked on how to update the Samsung Galaxy S2 I9100 to stock Android 4.1.2 firmware the XWLSD OS was out. Since then Samsung released a new ROM for the Galaxy S2, which comes to resolve the reported bugs from the XWLSD system. Therefore, today I will show you how to manually update your Galaxy S2 to official Jelly Bean 4.1.2 XWLSJ OS, the proper step by step guide being explained and detailed during the following lines, so for further info check the same.

The XWLSJ firmware is the latest official Jelly Bean update launched by Samsung for the Galaxy S2 GT I9100 handsets which means that the ROM can also be OTA or by USING KIES received and installed on your phone. Anyway, if you haven’t spotted the software until now don’t worry as the upgrade was released in limited markets only. Therefore, if the XWLSJ OS isn’t OTA available for you, then you will have to manually flash the Android 4.1.2 system on your Samsung Galaxy S2 and for that you have the present tutorial.

Remember that this is not the only official Jelly Bean firmware that has been rolled out for the S2, so if you want to check the other OS improvements I recommend you to take a look over our “update Samsung Galaxy S2” section; also, you will have there suitable guides that can be applied by those who are looking forward in installing a custom ROM, so don’t hesitate and use the same. Anyway, as I have already mentioned, this is the latest Jelly Bean OS meaning that we are dealing with the most stable variant of the Jelly Bean platform so far. All the bugs and reported issues have been resolved and some minor features and apps have been added, therefore your Galaxy S2 will be updated with an improved version of the Android 4.1.2 ROM.

Now if you do want to follow this step by step guide in order to update your Galaxy S2, then you will have to complete all the lines from below. You first have to check and apply the essential pre requisites and only after that you will be able to safely begin the flashing procedure. Don’t worry though as we are dealing with an official firmware, so the installation process can be easily performed.

Because of the up mentioned aspect, it is important to know that you don’t have to root your S2 before starting this guide. Furthermore, if somehow you have a rooted device, after applying the steps from below the root access will be revoked. Fortunately for you that mean that the warranty will be restored therefore you will be able to enjoy the default Jelly Bean system. If you will want to re root your phone, you will have to use a guide that is suitable with the new Jelly Bean 4.1.2 XWLSJ OS, or else you will risk in bricking your handset.

As you will see, for the flashing operation you will have to use Odin, so a custom recovery image isn’t required. In case your Galaxy S2 is being installed with such a tool it is recommended (though it is optional) to use the recovery for applying a wipe (boot into recovery image and select “wipe data factory reset” and “wipe cache partition) before using Odin for applying the Jelly Bean 4.1.2 update. Also, considering the same aspects, a backup must be performed before going any further. I strongly recommend you to save anything you need, starting from contacts, messages, call logs, market apps and ending with the internet setting and EFS folder.

As you can already tell, a Windows running computer with internet access enabled, your phone and its USB cord, must be near you. Now, in order to avoid the unpleasant situations do the following: uninstall all the security tools that are being running on your computer and smartphone because these programs are usually interfering with the update process; charge the battery of your device (if there is less than 60% power left) because your S2 might get turned off in the middle of our work; enable the USB debugging option on your phone (“Settings -> Applications -> Development -> USB debugging”) for being able to connect the same with the computer.

Finally remember that this tutorial will work only for those who own the Samsung Galaxy S2 model number GT I9100. If you try to apply the next steps on a similar or differed Android based smartphone you will risk in bricking your device.

How to Update Galaxy S2 GT I9100 to Official Jelly Bean 4.1.2 XWLSJ OS

  1. On your computer download Samsung KIES and install the drivers for the Galaxy S2; skip this step if the drivers are already installed.
  2. Download and install Odin; skip this step if on your computer Odin is already running.
  3. From here download the update file and extract the same on the computer.
  4. On your PC open Odin.
  5. Boot your phone into download mode: first turn it off and the reboot by pressing on the Power and Volume Up buttons at the same time.
  6. Now, connect your device with the computer by using the USB cord.
  7. Take a look on Odin; if you notice that the ID:COM is yellow or blue and the “added” message is being displayed, everything is perfect.
  8. If not, you need to close Odin, disconnect the phone from the PC, reinstall the drivers on the computer and repeat the procedure from the beginning.
  9. From Odin select the option named “PDA”.
  10. The pick the update file which was downloaded and extracted before.
  11. Click on “Start”.
  12. When the installation procedure is over you should see the “pass” message displayed on Odin.
  13. You can unplug the USB cable and reboot your smartphone as you are done.

If instead of a normal boot you will get a boot loop then, you need to reboot your device by pressing on the Volume Down and Power buttons at the same time for entering into recovery mode; from there select “wipe data factory reset” followed by “wipe cache partition. Then return to the main menu and choose “reboot system now”.

Also, in case Odin gets stuck, you need to: close Odin, remove the USB cord, force restart your device, re-install the drivers on the computer and re-peat the update procedure from the beginning. Now, you shouldn’t get any kinds of problems while trying to apply the Jelly Bean 4.1.2 XWLSJ OS.

Well, that was all; congratulations you have finally updated your Samsung Galaxy S2 to official Jelly Bean 4.1.2 XWLSJ software. Test the new firmware and see how it performs; then return here and share your impressions and thoughts with us and with other users too by using the comments area from below.

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