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Install Leaked, Rooted Android 4.1.2 Jelly Bean ROM On Galaxy S III

Samsung is really killing it with all the quick software updates for their top of the line Galaxy S series of smartphones. After Google itself and perhaps ASUS, the Korean electronics manufacturer is the fastest when it comes to the update-to-the-latest-version-of-Android game. Android 4.1.2 was leaked for Galaxy S II yesterday, and today we’ve come across Android 4.1.2 (JZO54K / I9300XXELK4) Jelly Bean for its younger, most advanced sibling: the Galaxy S III. Furthermore, this leak comes pre-rooted! Check out how you can install the leaked ROM on your Galaxy S III after the jump.

New features in Android 4.1.2 Jelly Bean for Galaxy S III are surprisingly interesting for numerically minor update (from 4.1.1 to 4.1.2).


Heard of the “Multi-View” mutli-tasking option that was included in Galaxy Note II that would let you snap two apps up and down so you can use both at the same time? Well, it’s part of the list of new features included in this release that are ported over to the Galaxy S III from the Galaxy Note II.


Yes, other things ported over from the Galaxy Note II include the “Paper Artist” app, Gallery app, and Smart Rotation (display orientation based on angle of sight instead of accelerometer).

Additionally, Samsung has also improved its custom keyboard by allowing you to string letters together to type words without lifting up your finger, much like Swype or the Android 4.2 keyboard. Also, the Notification Panel at the top can now also be customized, so you can choose toggles of your choice.

As we mentioned above, this leak has been rooted already and packaged in an odin-flashable format. Other than root access, nothing else has been modified and the ROM is fully stock in every other aspect.

Please note although people who have tested it feel that it is very stable, it may contain bugs and other issues that may hamper your daily user experience with the phone because it is, after all, a pre-release, leaked build.

Disclaimer: Please follow this guide at your own risk. AddictiveTips will not be liable if your device gets damaged or bricked during the process. Also note that flashing this firmware WILL add to your flash counter and change your device status to modified.


  • Galaxy S III GT-I9300 (International GSM model). Do NOT flash this ROM if your phone is any model of Galaxy S III other than GT-I9300.
  • Please ensure you have at least 50% battery left for this procedure.
  • A Windows-based PC since ODIN – the tool we’ll be using to flash the firmware – doesn’t work on other platforms.
  • Software for unzipping ZIP files. We strongly recommend 7-zip. It’s free, it’s fast and it works without any hiccups.
  • Samsung USB drivers installed on your PC.
  • USB Debugging enabled on your phone from Settings > Development.
  • Android 4.1.2 Jelly Bean leaked ROM downloaded to your PC.
  • Lastly, because this is a frequently asked question: you DO NOT need to root your phone to flash this ROM on your Galaxy S III.


  1. Make sure to sync your contacts and calender entries etc., and backup your SMS/MMS for just-in-case.
  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.
  3. Launch ODIN.
  4. Shut down your device. Once it is completely turned off, press and hold Home + Power + Volume Down buttons until your phone goes into Download Mode.
  5. Connect your device to your PC via USB cable. One of the boxes under “ID:COM” in ODIN will change its color to yellow.
  6. Click on PDA from ODIN and choose I9300XXELK4_I9300OJKELK5_HOME.tar.md5 from the ZIP file you extracted in Step 2.
  7. Ensure that re-partition option isn’t checked. Leave other options untouched.
  8. Click on Start and let ODIN do its thing. Your device will likely restart multiple times during this process; DO NOT interrupt it by disconnecting your phone.

If you followed the steps correctly, your phone will now boot into the leaked version of Android 4.1.2 Jelly Bean with TouchWiz. In case you experience any issues, boot into a custom recovery (like ClockworkMod or TWRP), wipe cache and dalvik cache, and reboot. If problems persist, perform a data wipe (factory reset) from recovery and reboot.

[via SamMobile]

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