Galaxy S III is the most powerful Android smartphone out there. It comes with Samsung’s custom UI called TouchWiz. Unfortunately it hasn’t gotten the Jelly Bean update throughout the world as of yet. Fortunately there is a custom ROM that will do just that. To top it off, it’s based on AOSP so it’s completely stock and devoid of any custom UIs.
ROM Information
- Omega v 2.0
- Based on AOKP Build-4 Jelly Bean 4.1.2
- Kernel Siyah-s3-v1.7b4
Do note that this ROM will work on the i9300 version of Galaxy S III only. Your phone needs to be rooted with a recovery installed. Backup all your data before continuing. The full guide on how to update Galaxy S III to stock Android 4.1.2 below.
Step 1. Download the ROM from here
Step 2. Connect your phone to the computer using USB cable. Enable data transfer/mass storage mode
Step 3. Copy/paste the file downloaded in step 1 to the root of the SD card (not in any folder)
Step 4. Disconnect the USB and turn off the phone
Step 5. Boot into recovery by pressing and holding Volume Up + Home + Power buttons together.
Step 6. Use power + volume buttons to navigate and perform a data and cache wipe
Step 7. Navigate to flash ZIP from SD card and choose choose ZIP from SD card
Step 8. Select the ZIP file downloaded in step 1. Select it using the power button and confirm installation
Step 9. Reboot
You now have a stock version of Android 4.1.2 on your Galaxy S III.