Update Galaxy S2 GT I9100G to Official Android 4.1.2 Jelly Bean XWLSR OS

The latest version of the official Android 4.1.2 Jelly Bean update is here, as the XWLSR firmware has been launched by Samsung for limited markets only. So, if you want to remove the previous reported bugs from the Android system, install new features and apply the latest Android experience available for your Galaxy S2 GT I9100G, completing this step by step guide is what you need to do. Therefore, during the next lines we will be checking on how to manually flash the stock Jelly Bean 4.1.2 XWLSR software on any Samsung Galaxy S2 model number GT I9100G devices.

This method should be performed by those who hasn’t received the OTA update yet, or by those who own a rooted handset; as you know a rooted system cannot be OTA or by using KIES updated with an official firmware. Also, this tutorial will be perfect for the users who are looking forward in restoring the Galaxy S2 warranty, because once the Android 4.1.2 XWLSR OS is installed, you will reset the flash counter. As you can see, there are many reasons why you should follow the steps from below, but if this is not what you are looking for, then you can anytime check our “update Samsung Galaxy S2” section.

As mentioned, this variant of the official Jelly Bean software brings some bug fixes, so you should know that the reported problems with the camera and with the Gallery have been finally resolved. Take note that this is only a minor improvement so don’t expect to see important changes on your Android 4.1.2 experience, though the Galaxy S2 system will now be optimized. Now, in order to safely install the XWLSR ROM on your S2 GT I9100G you must first prepare your phone and also apply the essential pre requisites; you have it all explained and detailed during the next list.

  • As mentioned, you don’t have to previously root your SGS2.
  • If your device is rooted, the root access will be revoked and the bootloader relocked.
  • Therefore, the warranty will be restored.
  • Even though this is the official update, you still have to backup the data before going any further.
  • After saving the contacts, messages, call logs and so on, ensure that you also backup the EFS and the internet settings.
  • A computer, or notebook with Windows installed is required.
  • The handset and its USB cord will be used.
  • On your S2 go to the path “Settings -> Applications -> Development -> USB debugging” and check the last option.
  • If you notice that there is less than 60% power left on your smartphone, take the charger and plug it in, or else the phone might get turned off in the middle of the update operation.
  • Uninstall all the security setting and programs that are running on the computer or SGS2.

Now, make sure that you apply the step by step guide only for flashing the stock Jelly Bean 4.1.2 on the Samsung Galaxy S2 model number GT I9100G. Using the below steps for a similar smartphone will brick the same, so be careful in what you do and try not to mess things up.

How to Manually Update Galaxy S2 GT I9100G to Official Android 4.1.2 Jelly Bean XWLSR OS

  1. First on your computer you have to download the update file and Odin.
  2. We will use Odin for flashing the update on your phone.
  3. The download link for the update file is here.
  4. Download Odin from here.
  5. Extract the update file on your computer and then install Odin.
  6. On the PC open Odin.
  7. Turn off the handset.
  8. Reboot it into download mode.
  9. The download mode can be reached by pressing and holding the Volume Down, Center and Power buttons together.
  10. While the device is in download mode, connect the same with the computer by using its USB cable.
  11. Now, on Odin the ID:COM section should be yellow and the “added” message should be there.
  12. If different, download Samsung KIES and install the proper drivers for your S2 and then repeat the procedure from above.
  13. Up next, click on “PDA” and select the update file (the .tar one).
  14. Click on “start” and in the end you should see the “pass” message displayed.
  15. Unplug the USB cable as you are done.

If by using Odin you can’t complete the update, unplug the USB cord and turn off the phone. Then remove the battery and re-insert it. After 5 seconds turn it on again and try to re-do the steps from the beginning; everything should be working fine now. Also, if after using Odin you will get a boot loop, try to do the following:

  • Boot into recovery mode (press on Volume Up, Home and Power buttons).
  • From there wipe the system.
  • You can make a wipe by selecting “wipe data factory reset” and “wipe cache partition”.
  • Then, choose “+++go back+++” and “reboot system now”.
  • The first boot might take longer than usual; don’t panic there is nothing wrong with your S2.

Well, that’s all for now. You have updated your Samsung Galaxy S2 with the official Android 4.1.2 Jelly Bean XWLSR OS. Test the firmware and share your impressions with us and with other users who might want to apply this tutorial. Also, stay close as we will bring more guides suitable with your S2 in the coming days.

  • KB

    my touch doesn’t work well when the charger is unplugged.
    i can’t even set screen lock pattern

    • Wiky

      I have the same problem ,do u know how to resolv or anyone ? pls

      • http://www.facebook.com/pho.kaung.92 Pho Kaung

        I’ve same problem, too.pls help?

        • nae

          After two monts still no resolution. Is sad.

          • http://www.facebook.com/ChenKiong Tan Chen Kiong

            any solution for this??

          • qubsica

            I changed the the screen on my i9100G and got this problem too.
            Before the screen cracked i got no problems whatsoever…..
            Maybe there is a hardware change in the touchscreen controller that make old kernel driver incompatible .. dunno. Hope there is a software workaround!

          • http://www.facebook.com/ChenKiong Tan Chen Kiong

            thanks

  • micho

    can i install it if i have tje zclp5 chinese software because i tried with the xxlsr and it didnt work

  • matt

    works well with my I9100G. but my juice going down faster than usual. is there something i need to do, tweak?

    • Puri

      Updated a few days back. The battery life has gone down considerably. I have to keep charging my phone through out the day. There is another problem. The phone goes on silent by itself and I have to restart the phone to make it ring again. Please help if anybody knows the solution to this problem.
      Other wise I may have to revert back to ICS only.

  • matt

    oh and it didnt not revoke my root access as you said it would. Anyway no biggie. thought i’d just mention it

  • mammad7

    are sure this is an official release?i have’nt seen this on sammobile

  • rajeev

    I was able flash the ROM on my phone GT-i9100G without any issues. Looks good so far.

  • Wiky

    my touch doesn’t work well when the charger is unplugged please help :(

  • Raj Rulz

    dont download dis man, itz shit..
    my phne is rebooting itself many times & samsung dudes said that after updating it io JB 4.1.2, 1GB of internal memory(11gb) would lost i mean it will be used, bt nthng happened like that, and some features also missing dudes…..

    wait 4 official update that popup through kies…

  • adnan mazumder

    i need help!!! i installed it and now my battery drains very fast plus my screen automatically lights up!! :( what am i suppose to do now?

  • Manish Singh

    Everyone seems to be having the battery drain issue including me. I wonder if Samsung guys test these builds thoroughly before releasing them. How hard is it to test the battery performance for God’s sake? All they had to do was to keep the damn phone on standby for a day.

    • Manish Singh

      Anyway, I have now installed the Slim ROM on my phone. Will see if that helps the battery better than the stock one.

      • Manish Singh

        Slim Bean ROM 4.2.1 turned out to be awesome. The battery life is 3 to 4 times more than Samsung’s Official Jelly Bean 4.1.2. I charged it full 3 hours ago and the battery percentage has dropped to 95% only. On Official Jelly Bean 4.1.2 however, it would have dropped to 80% by now. I think I am gonna keep slim rom on my phone now.

  • Riju

    Mostly pplz r complaing about this release but so far it’s working well in my phone. . .thanx for da rom..

  • Khan

    This is official, I checked sammobile, and its the same filename as the french version. So yeah…

  • aa

    try xxlsr its more stable

  • faizal

    i success install 4.1.2 but i got one problem with this ics .. less sensitivity touch screen when i try to drag my icon or remove it .. can solve my problem ?

    • suhailmul

      plc sent files

  • Hardy-D

    thanks a lot dear…
    its all work for me for my samsung galaxy s2 GT-I9100G…
    thanks a lot.
    enjoying my s2 with jelly bean…

  • Shib

    Updated a few days back. The battery life has gone down considerably. I have to keep charging my phone through out the day. There is another problem. The phone goes on silent by itself and I have to restart the phone to make it ring again. Please help if anybody knows the solution to this problem.

    If not help me any body , i will go back ICE version 4.0.4 it works better in samsung galaxy s2 GT-I9100G model.

  • Eeiinn Salihin

    Hello, still noob about this, can you show how you do it? maybe on youtube or somthing.tq :))

  • Muhammad Tahir

    after installing a custom ROM my IMEI is blank and Network won’t detect.
    anyone can help, please email on tahir@malakand.com

  • A.K

    can i upgrade my s2 from gingerbread to jellybean immediately? or need to upgrade sequences to ics first then jellybean? no risk about that?

  • iron ass

    i think the site that contains the jelly bean file has been shut ..pls post a different link