How To Update Jelly Bean 4.1 On Samsung Galaxy SII

Are you using Samsung Galaxy S II, but miss the new Android 4.1 (Jelly Bean) features in that. If yes, then don’t worry about that any more, with a recent leaked ROM you can easily install Android 4.1.2 Jelly Bean Operating System on your Galaxy S II Smartphone  It comes with official TouchWiz, “Inspired by Nature” sounds as similar to Galaxy SIII.
And it also comes with fully working Google Now and Google’s Project Butter feature. So, are you getting excited about that? Let’s start to install the new Android 4.1.2 Jelly Bean OS, in our Galaxy SII Smartphone.

First of all go and download the below things, which we required in our installation process:
Download and Install Samsung USB Drivers for Windows
Android 4.1.2 Leaked ROM for Samsung Galaxy S II, You can download it using any of the below methods
ZippyShare Links: Part 1 | Part 2 | Part 3
And a file compression software, such as WinRar or 7-Zip

NOW, FOLLOW THE BELOW STEPS:

• Please be aware that your Phone is atleast 50% charged and odn’t forget to backup/sync all your data.
• Now from the downloaded ROM files, you will only need CODE_I9100XXLSJ.tar.part1.rar, CODE_I9100XXLSJ.tar.part2.rar, CSC_HOME_OXX_I9100OXXLS1.tar.md5, MODEM_I9100XXLS6.tar.md5, and Odin3_v1.85.zip. So either you can separate these files from the rest files or you can delete the rest of the files, so that it can’t create any confusion.
• Now you have to Extract the contents of Odin3_v1.85.zip and CODE_I9100XXLSJ.tar.part1.rar to the same folder. This will extract both parts of the file from the two rar files, and you should now have a CODE_I9100XXLSJ.tar.md5 file in the same folder.
• Now you have to Remove the .md5 extension from CODE_I9100XXLSJ.tar.md5, CSC_HOME_OXX_I9100OXXLS1.rar.md5 and MODEM_I9100XXLS6.tar.md5 files. and after removing your file will be named as CODE_I9100XXLSJ.tar, CSC_HOME_OXX_I9100OXXLS1.tar and MODEM_I9100XXLS6.tar
• Download and install the USB drivers, if you don’t already have them installed.
• Put your Galaxy S II in download mode. To do this:
• Power the phone off.
• Press and hold the volume-down, home and power keys. You will be asked to press volume-up to install a custom ROM or volume-down to abort.
• Press volume-up to confirm and you will be in download mode.
• Connect the phone to your PC via USB and wait while Windows automatically configured the drivers.
• Run the Odin3 v1.85.exe file on your computer. If your phone is properly connected, One of the rectangular boxes under ID:COM (in most cases the very first one) should be yellow now.
• Make sure Re-Partition is unchecked, Auto Reboot is checked, F. Reset Time is checked, and Flash Lock is unchecked. Phone EFS Clear and Phone Bootloader Update should also remain unchecked. Leave pretty much everything exactly as it is.
• Click PDA and select the CODE_I9100XXLSJ.tar file.
• Click Phone and select the MODEM_I9100XXLS6.tar file.
• Click CSC and select the CSC_HOME_OXX_I9100OXXLS1.tar file.
• Click the ‘Start’ button. This will begin the flashing process, which can take several minutes. Wait patiently and do NOT disconnect your phone, or perform any intensive task on your PC. You will see a progress bar on both your phone and in Odin.
• Once the process finishes, your phone will reboot automatically. You may close Odin now.

Voila! Now you can enjoy the new Android 4.1.2 Jelly Bean features.