Step 1: Backup your galaxy s3 data, because you have to wipe the system.
Step 2: Start to save the contacts, messages and call logs, and then backup the EFS.
Step 3: Download Thunderbolt Custom ROM, this is a beta android 4.1.2 update. To install this firmware on your phone, you need to root your galaxy s3.
Step 4: Restore the warranty but only update with an official firmware released by samsung,or downgrade galaxy s3 to the stock ROM, then the bootloader will be relocked and the rootaccess revoked.
Step 5: Install a custom recovery image for your galaxy s3.
Step 6: Make sure that you can access a computer using usb cable.
Step 7: Uninstall both galaxy s3 and pc.
Step 8: Check the battery status of your galaxy s3, if there is less than 50% power left go and charge it. The CM10 and AOKP jelly bean software will be stopped.
Step 9: Enable the usb debugging option on your handset.
Update Galaxy S3 with Android 4.2 Thunderbolt Custom ROM Firmware
Step 1: Download the update file.
Step 2: Save the file on your pc.
Step 3: Connect the device with pc using usb cable.
Step 4: Select ROM from your computer and copy, paste it, or drag and drop to the phone'ssd card.
Step 5: Disconnect the galaxy s3 from the computer.
Step 6: Turn off galaxy s3 and reboot into recovery mode.
Step 7: Enter into recovery mode by pressing volume up and the home key and power button simultaneously.
Step 8: Once you enter into recovery mode, start the update operation.
Step 9: Select"wipe data factory reset" and "wipe cache partition". You have to backup galaxy s3 first to avoid losing your personal info.
Step 10: Select "+++go back+++" and return to the main menu.
Step 11: Select "install zip from sd card" and "choose zip from sd card"
Step 12: You can get and apply the ROM, just pick the downloaded file and start the flashing procedure.
Step 13: This installation process will cost a few minutes, don't press anyting.
Step 14: Select "+++go back+++" from the recovery menu follow by "reboot system".
-downloadatoz.com
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