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Update Sprint Samsung Galaxy S3 to custom Android 4.2.2 Jelly Bean using CM 10.1 RC1 ROM

CyanogenMod team has released a new build for the CM 10.1 and, this one is the Release Candidate 1 snapshot, a ROM that incorporates all changes previously released in Nightlies and M builds. It is based on AOSP Jelly Bean 4.2.2 OS and you can use this tutorial and learn how to successfully flash all the required files. Read all the instructions that I’ve listed and make sure that you won’t skip any steps so that you’ll manage to update your phone at your first attempt.

The Sprint Galaxy S3 device can be easily updated with CM 10.1.0 RC1 ROM using this guide, but first you will have to take a look at the preparation info below. It teaches you what you have to do in order to make sure that the phone supports the new OS and how you could backup some data before applying the changes. Here’s what you need to know:

  • use the tutorial only for the Sprint variant of Samsung Galaxy S3 device. Don’t try to use the files you find her on any other smartphone or tablet running Android.
  • your phone has to be on an unlocked bootloader, rooted and running a custom Recovery image such as CWM or TWRP. We’ve used the CWM Recovery with this guide.
  • create a NANDROID backup of your current ROM using the Recovery mode. It will create a restore point for your phone and you can use it in case the new OS doesn’t boot into normal mode.
  • the tutorial contains a step that tells you to wipe data and factory reset the device, which means that you will lose the contents of the /system partition. That’s why you can choose to backup SMS, Call Logs and APN internet Settings using these tools: SMS backup & restore | Call Logs backup & restore | APN Settings Backup & Restore. Note that you might need to grant root access for these apps.
  • Also, you should sync the Contacts info with the Gmail account you’ve assigned for your device.
  • Make sure that the device has enough power left in its battery before it completely discharges.
  • Enable the USB debugging option from the Android developer options menu.
  • Note that we cannot be blamed in case you damage your device nor in case you lose any important files in the process.
  • read the entire post and don’t skip any of the instructions that I’ve listed below.

I think that these were all the preparation steps you had to go over before continuing to the next part of this post.

NOTE: in case your device is already running on a previous build of CM 10.1 ROM then you can skip the ‘factory reset’ action. But, in case you complete the tutorial and the phone refuses to boot with the Release Candidate 1 build of CM 10.1, then you will be forced to re-enter Recovery mode and factory reset the phone for it to boot the new home screen.

How to install CM 10.1 RC1 Jelly Bean ROM for the Sprint Samsung Galaxy S3:

  1. Download the CyanogenMod 10.1.0 RC 1 build from HERE. Save this file on your computer without extracting its contents.
  2. Download Gapps for Android 4.2.2 ROMs from HERE. Don’t unzip and place the file on your computer.
  3. Connect the phone to PC via USB cable. Move both download files onto its internal SDcard. Disconnect the device after the files are copied with success.
  4. Power off your device now.
  5. Boot your phone into CWM Recovery mode now.
  6. When you’re at the main custom Recovery menu you should select ‘backup and restore’ option. Create a NANDROID backup if you didn’t create one until now.
  7. Next, select ‘wipe data/ factory reset’ option. Confirm. NOTE: if your device is running on a previous build of CM 10.1 Nightlies / M snapshot, then you can skip this step.
  8. Select ‘install zip from sdcard’. Next, select ‘choose zip from sdcard’ and then browse your phone for the CM 10.1.0 RC1 zip and confirm that you wish to install it.
  9. After the ROM is installed, you should select again ‘choose zip from sdcard’. Find the Gapps file and install it.
  10. Return to the main Recovery screen when both files have been installed.
  11. Select ‘reboot system now’.
  12. Wait for the first boot process of CM 10.1 RC1 to complete.
  13. Enter your Google account details and take control over all the new functions of your phone.
  14. Test all its features and tell us in comments if you find any problems with it.

If you cannot complete the update at your first attempt, then you will have to repeat the tutorial several times and make sure to apply step 7 actions.

If you don’t like how the CM 10.1 RC1 works with your Sprint Galaxy S3, then you can restore the device to its previous ROM using the CWM Recovery and the NANDROID backup file created in step 6. For any other questions, use the comments section.

I hope that you’ve managed to update your Sprint Galaxy S3 to Android 4.2.2 JB custom ROM using this guide. Note that this CyanogenMod 10.1 will eventually reach a ‘final’ build for your device in the near future and we will post another guide when that happens.