Update Galaxy S2 I9100 to XXLSJ Android 4.1.2 Jelly Bean Leaked Official Test Firmware

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Android 4.1.2 for Galaxy S2 I9100 is now available as a leaked official test firmware! Just today, we got Android 4.1.2 leaked for Galaxy S3 I9300, and now Galaxy S2 I9100. We know you can’t wait to give this firmware a try. XXLSJ Android 4.1.2 is not an official firmware on Samsung KIES, but a leaked test firmware that has somehow come online for everyone to try what Samsung will be bringing to the Galaxy S2 I9100 with their Android 4.1.2 Jelly Bean update! We have the download link and a complete tutorial for I9100XXLSJ — and also how to root Jelly Bean on SGS2. You can easily install XXLSJ Android 4.1.2 Jelly Bean on Galaxy S2 I9100 using the tutorial given below.

As you continue reading below, we will guide you through the entire process of how to update Galaxy S2 I9100 to XXLSJ Android 4.1.2 Jelly Bean using ODIN. This latest I9100XXLSJ firmware has been leaked online – it is a pre-release test firmware. Make sure you backup all your data before trying this and you know what you are doing. Let’s continue with the tutorial below.

Galaxy S2

UPDATE: The official Android 4.1.2 (build XWLS8) Jelly Bean firmware update is now available for the Galaxy S2 I9100. Read the tutorial here!

Disclaimer: All the tools, mods or ROMs mentioned below belong to their respective owners/developers. We (TeamAndroid.com) or the developers are not to be held responsible if you damage or brick your device. We don’t have you on gun point to try out this tutorial ;-)

Galaxy S2 I9100 XXLSJ Android 4.1.2 New Features:

  • Buttery Smooth Performance & Great Stability (Thanks to Project Butter)
  • New TouchWiz Nature UX (Same UI as of the Galaxy S III and Galaxy Note II)
  • Samsung’s Cloud services
  • Direct Call, Smart Stay and Pop-up Play Features
  • New Widgets From the Galaxy S III
  • 2 Home screen modes
  • New Notifications bar
  • Google Now

Android 4.1.2 XXLSJ Firmware Details:

Android Version: 4.1.2 – JZO54K (Jelly Bean)
PDA: I9100XXLSJ
CSC: I9100OXXLS1
MODEM: I9100XXLS6
Changelist: 462349
Build Date: 6th November 2012

Make sure you have installed all your USB drivers for the Samsung Galaxy S II to connect it with the computer. Download Samsung Galaxy S2 USB drivers! Apart from just the USB drivers, there are a few more things that you need to take care of.

UPDATE: Android 4.1.2 official firmware is now available for the AT&T Galaxy S2 SGH-I777. Read the tutorial here!

1. You need to enable USB debugging mode. This helps to connect your Android phone with the PC. See here: How to Enable USB Debugging.

2. Your phone battery should be 80-85% charged. If your phone goes off suddenly because of battery, during flashing ROMs or installing mods and updates — your phone might go dead permanently. See here: How to Check Battery Percentage.

3. Backup all your important data that you might need as soon as your flash a new ROM, or make a backup for just in case, you never know when anything might go wrong. See below on how to backup data:

Data can also be backed up using Samsung KIES for their devices, but if you backup data manually, you get more options what top choose from and it is very easy to move data across Android devices from different manufacturers, i.e moving Samsung Galaxy Note backup data to HTC One X.

4. Your phone should be factory unlocked. Additional instructions for locked Android devices will be added in the tutorial for unlocking devices.

Now, let’s proceed with the tutorial on the next page and update Galaxy S2 I9100 to XXLSJ Android 4.1.2 Jelly Bean leaked firmware.


  • targnik

    Can we just flash CODE file?? Or, just CODE & CSC… I’d like to keep my modem

  • Pingback: Android 4.1.2 XXLSJ Jelly Bean Leaked Official Firmware for Galaxy S2 I9100 [How to Install Manually] | Galaxy SIII

  • S

    Hello there! thanks for the tutorial. I have a question. My S2 i9100 is locked to EE (T-MOBILE) UK network. Will this stop me completely from upgrading to 4.1.2? Also. How do I unlock my phone? Any information is highly appreciated. Again, thank you for your tutorial and your work :) Regards, S.

  • Piotr

    Help . when i plug in my phone to computer while it’s turned on , it’s working fine . but when i am piugging it in download mode ,odin and my computer doesn’t find my phone . and it can’t found drivers to galaxy s2

  • farag

    can i read arabic words? or it doesnt support plz help

  • Ruchir Shah

    Cannot join/merge contacts in this firmware.
    The JB buttery experience hasn’t been optimised.
    Some lags also occur.

  • Fabio

    it’s seems to be crashing during the upload onto the device in Odin (on the Hidden.img). What to do?

    • http://www.facebook.com/cyrilhyori.carbungco Sai Hyori Carbungco

      i do have the same problem what will i do then it stocks at the hidden.img part and took me a day but still no movement on the status bar. what will i do please reply on this. thank you

  • http://www.facebook.com/wsjunior85 Waldemar Silva Júnior

    Is there any way to do the same using Heimdall instead of Odin? If the answer is yes, how to do that? Sorry, MacOSX user. Thanks in advance.

  • Gheorghe

    Salut sgs2 cu (Android 4.0.3) și am fost problema, ei vor să instaleze orice apk buton installl nu reactioneaza chiar ajuta, care sfatul

    mi scrie: isac_gheorghe@mail.ru

  • http://www.facebook.com/profile.php?id=1349384168 Bruno Laloum

    thanks a lot for this tutorial, even though i semi bricked my phone at the first attempt…. you should add in the tutorial the “Wipe data/factory reset then wipe cache” step before the flash, and make sure no Kies process is running before flashing

  • Rodrigo

    very, very, very good!

  • Pavel

    Thanks =)))) iv been successfully updated my sgs II to latest version but all my music , contacts , apps and msges deleted (its my trouble i havnt made backup =((( )
    But now i have new phone =))))