If you own the i9100 Samsung Galaxy S2 handset you can make the update to Jelly Bean 4.1.2, as the firmware came out in Hong Kong, China and Taiwan. The firware is Android ZSLSE and it doesn’t have branding and it include the Chinese language packs.
Bear in mind that the firmware is not custom and this means that there are no changes and it doesn’t give you Clockwork Mod.
The update does offer Project Butter along with a new TouchWiz interface, S Cloud, Pop up play, Smart Stay and a lock screen that is customisable. If you update you also get your hands on Dropbox storage of 50GB. The update offers improvements to Google Now along with a new notification bar and more than one home screen.
The firmware is only for the international version so check to make sure that the model number is i9100.
You should back up the device before going ahead and making the update and you will need the USB drivers on your computer.
Head to Settings – Developer options and enable USB debugging and also check to make sure that you have around 80% battery before carrying out the update. Of course you also need to have a handset that is unlocked.
Once you have installed the update you will need to root your device and of course you carry out the update at your own risk.
To go ahead and install the update carry out the steps below.
Step 1 – Download Android 4.1.2 ZSLSE official firmware for Samsung Galaxy S2 on the computer and extract the zip file.
Step 2 – Download ODIN v1.85 which is needed for installing the official Android 4.1.2 XSLSE Jelly Bean update on Galaxy S2 I9100.
Step 3 – Power off the Samsung Galaxy S2 and boot it into Download Mode. To do so, press and hold Volume Down and Home buttons together, and then tap the Power button until the construction Android robot icon with a triangle appears on screen. Hit the Power button again to progress into Download Mode.
Step 4 – Launch ODIN on computer and connect the phone to it while the Samsung Galaxy S2 is still in Download Mode.
Step 5 – When the Samsung Galaxy S2 connects successfully, one of the ID: COM boxes indicates yellow with the corresponding COM port number. This step may be time-consuming.
Step 6 – Choose the files that need to be flashed or installed on the phone, which can be found among the extracted files in Step 1.
Click the ‘PDA’ checkbox and choose the file named ‘.tar or ‘.md5′.
Hit the ‘Phone’ checkbox and choose the file named ‘MODEM’. Ignore this step if there is no such file.
Tap the ‘CSC’ checkbox and choose the file named ‘CSC’. Ignore this step if such file is missing.
Click the ‘PIT’ checkbox and choose the .pit file. Ignore this step if such file is absent.
Step 7 – In ODIN, enable Auto Reboot and F. Reset Time options. In case of Re-Partition option, check it ONLY if a .pit file was chosen in the previous step.
Step 8 – Hit Start button in ODIN and the firmware installation process will begin. It would take just a few minutes to complete.
Step 9 – Once the firmware installation is complete, the Samsung Galaxy S2 will reboot. When the home screen appears, Disconnect the phone from computer. You should now have Android 4.1 Jelly Bean on your Samsung Galaxy S2.