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Update AT&T Galaxy S3 I747 to Official AOKP Jelly Bean 4.1.2 Build 5 custom ROM

Here you can find all the steps that you need to take in order to get the AOKP JB Build 5 on your AT&T variant of Galaxy S3. Note that this is an update that is based on Android latest 4.1.2 Jelly Bean firmware and it means that you will get the best experience for your smartphone.

It is an official AOKP update and it doesn’t bring too many new features but it will make your phone’s OS even more stable than before. Bugs and errors that were present in previous releases have been fixed and you shouldn’t see any of them with this new build.

In order to correctly flash this update, you will first have to read the pre-requisites guide. Also, you will find useful instructions on which tools you can use in order to backup all important files that are currently stored on your AT&T Galaxy S3. Read the lines below and only when you’re sure that you can successfully flash AOKP JB Build 5, move to the next part of this article:

  • the custom ROM zip files found in the tutorial will work only with the AT&T version of Samsung Galaxy S3 model number I747. Check the phone info by going through ‘Settings’ and opening the ‘about device’ menu.
  • The smartphone you’re about to update should have CMW Recovery installed and it has to be rooted, obviously.
  • Use the following applications if you want to backup a list of apps currently installed on your phone, the SMS, Call Logs and the values of APN Internet Settings: SMS backup & restore | Call Logs backup & restore | APN Settings Backup & Restore | AppBack for Android. Root access is needed for some of these apps.
  • Sync the Contacts app with the Gmail assigned you’ve assigned for your AT&T SGS3.
  • Create a full ROM backup of the existing Android OS. You will need this in case the update is not correctly applied and the phone refuses to boot.
  • Charge the phone’s battery so that it won’t switch off in the middle of the updating process.
  • We will not be responsible in case you cannot use your phone after installing this custom ROM.
  • Apply all the steps I’ve listed and use the comments section in case you cannot understand some actions in this article.

That’s all you had to know before starting to update your smartphone. For any other questions you can use the comments filed at the end of this post.

How to install AOKP Jelly Bean 4.1.2 Build 5 on AT&T Galaxy S3:

  1. Download the ROM from this link here.
  2. Download Gapps from here. Get the latest version for Android 4.1 Jelly Bean and not the variants for older Android OS.
  3. Use the USB Cable to connect the AT&T SGS3 to your PC and move the files above on the smartphone’s internal SDcard. Unplug the phone from PC.
  4. Power OFF your Galaxy S3 and then boot it into CWM Recovery mode. Do it by holding at the same time ‘volume up’, ‘home center’ and the ‘power’ buttons. Release these when the display powers ON.
  5. Select ‘wipe data/ factory reset’ option. Confirm this and then move to the next step. NOTE: If you’re already using the AOKP JB Build 4 then you can skip this step as you won’t have to wipe the data. NOTE2: The data from internal SD card will be left intact, as only the /system partition will be removed.
  6. Next, select the option that says ‘install zip from sdcard’. Now select ‘choose zip from sdcard’ and find the AOKP JB Build 5 zip. Install it.
  7. Repeat step 6 and this time you have to install the ‘Gapps’ for Jelly Bean zip. Confirm the process and when the files are installed with success, return to the main CWM Recovery.
  8. Choose ‘reboot system now’ option.
  9. The smartphone restarts right now and the first boot process with the new ROM will not take more than 5 minutes to complete.
  10. Enter your Google Account credentials and take control over your device once again.

NOTE: In case the first boot takes too long or the phone enters a boot loop, then you should power off the phone, remove the battery and then put it back. Repeat the entire tutorial once again and now you should apply step 5. You should be able to flash the update at the second attempt.

If you’re experiencing too many problems then tell us in comments. Also, if you don’t like the new ROM then you can use the ROM backup file and restore the device to the previous Android OS firmware.