Install CM 10.1.0 Final ROM for AT&T Samsung Galaxy S3 I747 (Android 4.2.2 Jelly Bean ROM)

Flash CM 10.1.0 Jelly Bean Stable Build for AT&T Samsung Galaxy S3

AT&T Galaxy S3 can now be updated with the first stable build of CyanogenMod 10.1.0 ROM. Use this tutorial and learn how to successfully install all the required files without bricking your device.

For this tutorial to complete correctly, you will need to read the following guideline:

  • use this post only with the AT&T variant of Samsung Galaxy S3 model number I747.
  • don’t try to flash the files on any other Android device, as you will end up bricking it.
  • your SGS3 has to be rooted and running a custom Recovery like CWM or TWRP. For this tutorial, I’ve used the CWM variant, but the TWRP will work too.
  • use the custom Recovery Mode to create a full NANDROID backup of your current ROM. This will act as a restore point that you can use in case your device doesn’t boot with the new OS.
  • in the ‘how-to’ part of this article, you’ll find a step that will ask you to ‘wipe data/ factory reset’ your phone. Without this you cannot complete the tutorial.
  • ‘factory reset’ step will delete the contents from your device’s system partition, which means that all installed apps, SMS and other similar data will be wiped completely.
  • look for a tool on Google Play Store that can help you backup data such as installed applications and other app files.
  • in order to backup SMS, call logs info and APN internet Settings using the following tools for Android: SMS backup & restore | Call Logs backup & restore | APN Settings Backup & Restore. Root access is needed for some of these apps.
  • also, backup the Contacts info by syncing it with your Gmail account.
  • enable USB Debugging from Developer Options.
  • make sure that your device has enough power left in its battery, so that it won’t power off in the middle of the updating process.
  • this is a tutorial for advanced Android users and you can’t blame us in case you lose important data or you brick your device.
  • read the entire post first and don’t skip any steps.
  • note: it doesn’t matter if you have a previous CM 10.1 build installed on your AT&T SGS3, you still need to apply a ‘factory reset’ before installing the new CM ROM. So, you’re advised not to skip step X actions.

Now that you know all that, continue to the how-to guide and flash the latest CyanogenMod 10.1.0 Stable Build for your device.

How to install CM 10.1.0 Stable Jelly Bean 4.2.2 ROM for AT&T Galaxy S3:

  1.  Download the CM 10.1.0 Stable zip from HERE.
    > do not unzip its contents and place the file on your PC.
  2. Download Gapps for CM 10.1 or Android 4.2.2 JB Custom ROMs from HERE.
    > save it on your computer without extracting its contents.
  3. Next, connect the SGS3 with your PC using the USB cable.
  4. Move both files downloaded in steps 1 and 2 on your phone’s internal storage. When the files are copied with success, disconnect the device from PC.
  5. Power off your smartphone now.
  6. Next, boot it into CWM / TWRP Recovery Mode.
    > I have used CWM for this tutorial, but the TWRP one will work in the same way.
  7. When you’re at the main Recovery menu, select ‘backup and restore’. Create a NANDROID backup of the ROM that’s currently installed on your device.
  8. Select ‘wipe data/ factory reset’ and confirm this process.
  9. Now, you need to select ‘install zip from sdcard’ and then ‘choose zip from sdcard’. Find the CM 10.1.0 Stable zip file and confirm that you want to install it.
  10. After the new CyanogenMod files are successfully installed, you will have to select again ‘choose zip from sdcard’.
  11. Find the Gapps zip and install this one too. When the installation is complete, return to the main CWM Recovery mode menu.
  12. Select ‘reboot system now’ and wait for your device to complete its first boot process with the new OS.
  13. Enter the Google Account info and take control over your AT&T Galaxy S3 functions. Test the new CM features and tell us in comments how’s your device working with all these new changes.

These were the steps that you had to follow in order to successfully flash this brand new ROM.

If the first boot process takes too long to complete, you will need to power off the device completely. Remove its battery and re-insert it after several seconds have passed. Now, you should repeat the entire tutorial once again, but this time you make sure not to skip any steps that I have listed above.

If you don’t like how the CM 10.1.0 Stable ROM is working with your AT&T Galaxy S3, then you can restore the NANDROID backup of your previous ROM. Also, if you’re having any problems with the installation or with how the new ROM runs on your device, then you leave a detailed comment at the end of this post and we will try to come up with a viable solution for your problems.

  • Jaime Musignac

    Until now, the only issue that I noticed is the signal bars are lower than before.

  • Jaime Musignac

    But the upgrade process was perfect without flaws.

  • Honey

    how long should the rebooting process take?