Samsung Galaxy S2 Android 4.1 Jelly Bean Update (Instructions)


An update has come out for the Samsung Galaxy S2 international version to take it to Android 4.1.2 Jelly Bean. The update has come out in China and Taiwan and it is Android 4.1.2 ZSLSE and it isn’t branded plus it comes with Chinese language packs. So if you want to update your Samsung Galaxy S2 and it is not locked to a carrier you can go ahead and install it using the instructions below.

As the firmware is not custom, no changes have been made to it and so it doesn’t have ClockworkMod.

However it comes with a revamped interface and it brings Project Butter. It offers the TouchWiz interface and S Cloud, a new lock screen, Direct Call, Pop up Play and Smart Stay. Samsung Galaxy S2 users can also get 50GB of Dropbox storage. There are different home screen modes and Google Now, plus a redesigned notification bar.

Bear in mind the firmware is just for the international version of the Samsung Galaxy S2 though, with the model number of i9100.

If you want to go ahead and install the update make sure that you have made a back-up of your handset and that you have installed the USB drivers onto your PC.

You should make sure that your battery has been charged to at least 85% and that USB debugging is enabled. To do this you should head to Settings > Developer options.

If you have rooted your Samsung Galaxy S2 this will be lost and you will have to reinstall 3rd party apps.

If you want to go ahead and install the update, here are step-by-step instructions.

Step 1 – Download Android 4.1.2 ZSLSE official firmware for 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 phone 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 phone 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.

Your Samsung Galaxy S2 should now have the Android 4.1.2 Jelly Bean update and you can enjoy everything that it has to offer.


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