Install Official Android 4.1.2 Jellybean on Galaxy S3 i9300

Official Jellybean android 4.1.2 for Galaxy SIII has been leaked, and it is very stable.

What’s New in Android 4.1.2 JellyBean on Galaxy S3 i9003

Other than all the android 4.1 JellyBean goodness, Android 4.1.2 in International Galaxy SIII brings Note 2’s Multiwindow multitasking (Multi-View) features, which had been stealing the show in Android world with simultaneously running of apps in split-screen.

Android 4.1.2 (JZO54K / I9300XXELK4) Jelly Bean for Galaxy S3 is super smooth as butter and full of features that have been only available on Galaxy Note 10.1, Note 2.

Not just Multi-View, it also features other Note II apps like “Paper Artist” app, Gallery app, and Smart Rotation.

Additionally, the new keyboard allows you to string letters together to type words without lifting up your finger, much like Swype or the Android 4.2 Jellybean keyboard. You can also enable/disable Toggles.

Additionally, this leaked ROM is stock Rooted, available in typical odin-flashable format. Rest of the ROM is very stock.

Pre-requisites

• Galaxy S III GT-I9300 (International GSM model). This will not work on any other model.
• ODIN + Windows PC and Samsung USB drivers.
• [Download] Android 4.1.2 Jelly Bean ROM

How to Install Android 4.1.2 JellyBean on Galaxy SIII i9003

Step 1. This process may erase ALL your data, make all necessary backups if you need to. If you’re rooted, you can use TitaniumBackup, else use KIES to backup data.

Step 2. Extract the contents of the Android 4.1.2 ZIP file using 7-zip. Inside it, you will find the actual firmware in the form of a TAR file, and ODIN v3.04.

Step 3. Open ODIN and Power off your phone. Lets mode put it in download mode by holding Home + Power + Volume Down buttons until you see indication on your S3.

Step 4. Attach phone to PC via USB, and you’ll see a COM connection to ODIN on PC.

Step 5. Click on PDA from ODIN and choose I9300XXELK4_I9300OJKELK5_HOME.tar.md5 from the ZIP file you extracted in Step 2.

Step 6. Leave other option un-altered and Click Start.

Let it finish its job and it may restart multiple times during this process. Please don’t interrupt this process, otherwise you can brick your device.

On next boot, you should boot into Jellybean 4.1.2. Enjoy!

Troubleshooting: If you’re stuck in boot-loop, you might have to clear data (factory reset).

To enter recovery mode, Hold down  Home + Power + Volume Up, and leave power key when u see boot logo. You should enter the CWM recovery. Go ahead and wipe cache, dalvik cache, and reboot. If that doesn’t help, perform a data wipe (factory reset) from recovery and reboot.

Related: Get Galaxy Note 2 MultiWindow Multitasking, AirView Features on Note1
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