How to update Samsung Galaxy SII to Official Jellybean 4.1.2 XXLSJ Firmware – Root and Recovery

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Samsung Galaxy S2 finally got official Jellybean 4.1.2 XXLSJ Firmware Update. Big brother Galaxy S3 has already got its official Jellybean 4.1 update now it’s time for Galaxy S2. But still no ETA on by when it will be rolling out officially but it is said to roll out very soon.

How to Upgrade Galaxy S2 GT I9100 with Official Jellybean 4.1.2 Firmware

If you hate to wait then you can install this official jellybean 4.1.2 build Rom manually through our process.  The most exciting part about this firmware is that it’s the Official firmware which got released from Samsung and is dubbed as XXLSJ as the build number and the baseband version as XXLS6, while installing this firmware you shall able to root it to. After installing this firmware you will get update with 50GB Dropbox space. So without wasting time let’s move to the procedure.

Pre-requisites:

At SamsungMobileClub we make sure that our readers take all precaution and preventive [prevent data loss and soft Bricks] measures before installing ROM, Root or flashing firmware.

This procedure is only for Samsung Galaxy S2 GT I9100 not for any other variants. If you try this procedure on other device, may have undesirable outcomes. It is not Samsungmobileclub neither developer responsibility if your device get damaged with this procedure.

We have explained all required steps in detail:

Step 1: To ensure that you do not lose anything, please create backup of SMS, Contacts, APN settings, Whatapp chat messages etc. [Alternative link to backup SMS, MMS, Contacts, Calendar, events on Samsung Android Phones]

Step 2: Please ensure that you have a desired battery level to perform the procedure [we suggest minimum 60%]. While Installing any ROM or rooting your device it is required to enable USB debugging. You will find USB debug enable options in Settings>>Developer option. If you still do not get it, check out our detailed tutorial about Enabling USB debugging and checking batter status /Usages.

Step 3: We suggest a full backup of your apps and cache data, if you are rooted use Titanium Backup [App backup and Restore tutorial] or you can follow this tutorial to backup without root access.

Step 5: Please disable Antivirus, Firewall or other security apps before flashing Root, Firmware or ROM as them may interrupt the procedure. We also suggest disabling Samsung Kies if you are flashing through PC.

Step 6: While installing this firmware your device root privilege will gone, if you have rooted earlier (Because of original stock firmware).

Download Section:

  • Download ODIN v3 and install it on your PC
  • Download Official Jellybean 4.1.2 Package (Alternate Link). Extract this package in your desktop where later we can find it with Odin program.
  • Download XXLSJ Firmware rooting Package and same extract it in safe place. Don’t Mix Both files(Firmware and rooting package)

How to Upgrade Galaxy S2 GT I9100 with Official Jellybean 4.1.2 Firmware:

Step 1: First install the Odin program in your PC and run the program. Now, turn off your Galaxy S2 GT I9100 and restart in download mode.  Download Mode is a place where Odin detects your device or handset in PC and transfer the firmware file. Press the Volume Down + center key simultaneously and then Power button till the screen turns on after which a green robot will be shown indicating the Download Mode has been entered.

 Step 2: Now, Connect your Galaxy S2 GT I9100 to PC with the help of original USB cable at this time Odin must be opened in your PC. If your drivers are properly installed then you should get the message “Added !!” under Odin’s message box in the bottom left and Odin ID: COM section will turn Yellow that means PC detected the device.

How to Upgrade Galaxy S2 GT I9100 with Official Jellybean 4.1.2 Firmware

Note: If Odin will not detect the device then install the driver properly as provided or through Samsung Kies (it also helps to install the driver). After installing driver please uninstall the Kies and disable the antivirus, as it also trouble in Odin procedure.

Step 3: Now in Odin PDA option select the extracted file CODE_I9100XXLSJ, Phone – MODEM_I9100XXLS6 and CSC – CSC_HOME_OXX_I9100OXXLS1. All these files you will get in extracted package. Please check the Auto Reboot and F. Reset Time options should be enabled and all other options should be disabled.

How to Upgrade Galaxy S2 GT I9100 with Official Jellybean 4.1.2 Firmware

Step 4: Once you have configure all the files Hit on Start button in ODIN. Installation process will start and would take around 5 minutes or above for applying this update. A “PASS!” message will also appear in Odin and your phone will automatically restart. Now,  you can safely disconnect your phone from your computer.

Once the device restarts, the phone will show up the home screen and all you need to do is to just follow the on screen instructions for starting the device. To check whether the firmware has been successfully updated or not, Go to the path “Settings > About Phone” where the current firmware will be mentioned as Jellybean 4.1.2.

How to root Galaxy S2 GT I9100 in Official Jellybean 4.1.2 Firmware:

Same procedure Open Odin program in your PC, restart your Galaxy S2 GT I9100 in Download Mode by pressing the Volume Down + center key simultaneously and then Power button till the screen turns on after which a green robot will be shown indicating the Download Mode has been entered.

Now check on Auto Reboot and F. Reset Time to enable it and leave other options as it was, to to PDA section and select the extracted file. Click on start button and the rooting process will begin. A “PASS!” message will same appear when you see the message, you can safely disconnect your phone from your computer.

That’s it you have rooted your device, you can check your  root privilege with Root Checker app from GooglePlaystore.

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One thought on “How to update Samsung Galaxy SII to Official Jellybean 4.1.2 XXLSJ Firmware – Root and Recovery

  1. hi Shailesh, hopefully you can clarify it for me. i’ve changed 5 different roms so far without any trobles and now i came to NEAT LITE. i like it a lot, but like all others wanted to try another rom and get stuck here. every time i try to flash different rom it won’t allow me to do it, either installer won’t flash anything or it comes up with some error.before i had no problem going from rom to rom but now it seems i cannot leave NEAT LITE. not that i don’t like it but i just want to find out where i’m making a mistake. thanks

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