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Flash CM 10.1 Release Candidate 1 build ROM for the T-Mobile Samsung Galaxy S3 (Android 4.2.2 Jelly Bean ROM)

CyanogenMod team has released the CM 10.1.0 Release Candidate 1 build for the T-Mobile Samsung Galaxy S3 phone. Use this tutorial and learn how to successfully flash the new OS for your device.

The CM 10.1 ROMs are based on the Android 4.2.2 Jelly Bean and these are some of the best alternative ROMs for the Stock T-Mobile / Samsung TouchWiz and Nature UX interfaces. It packs all the AOSP Jelly Bean features plus multiple other CyanogenMod proprietary functions and services that should improve your overall Android experience.

The installation of this new ROM should take place in maximum 5 minutes. However, it would be best for this guide to be applied only by those users who know what they are doing and not by novices. If you’re a novice when it comes to installing new custom ROMs for Android phones, then it would be better to ask for extra help in comments, as we will try to offer you the best possible assistance.

This build is the most stable release since the CM 10.1 Nightlies and M snapshot builds. In order to successfully install it on your device, you will first have to read the guidelines below:

  • this guide works only with the T-Mobile variant of the Samsung Galaxy S3.
  • your phone has to be factory unlocked, rooted and the CWM Recovery has to be installed on it. You can use the TWRP Recovery in case that’s the recovery you have installed for your device.
  • use the custom Recovery and create a full NANDROID backup of your current ROM.
  • backup SMS, Call Logs and APN Internet Settings using the following tools for Android: SMS backup & restore | Call Logs backup & restore | APN Settings Backup & Restore. Note that root access will be needed for some of these tools.
  • sync your Gmail account with the Contacts info using this guide here.
  • enable USB Debugging option from the Developer Options menu in Settings.
  • make sure that the phone’s battery is charged and that it won’t power off during the updating process.
  • this is a guide for advanced users.
  • don’t blame us in case something goes wrong and you lose any data in the process.
  • you can’t held us responsible if the phone is bricked while you’re trying to flash a new custom ROM.
  • read the entire post and make sure that you won’t skip any steps listed below.

NOTE: in the tutorial you’ll find a step that asks you to wipe data and factory reset the phone and, in case your device is already running on a previous build of the CM 10.1 ROMs then you can skip this step. This is called a ‘dirty flash’ and you can apply it only over previous builds of the same ROM.

Now that you know all of the above, I think that you can continue to the next part of this post.

How to install CM 10.1 Release Candidate 1 Jelly Bean 4.2.2 ROM for the T-Mobile Samsung Galaxy S3:

  1. Download the CM 10.1 RC1 ROM zip from HERE. Save the file on your PC and don’t unzip its contents.
  2. Download Gapps for Android 4.2.2 ROMs from HERE. Don’t extract the zip and save it on your PC.
  3. Connect the phone to PC. Move both downloaded files onto your device’s internal SDcard. Disconnect the phone from computer when the files are copied with success.
  4. Power off your phone.
  5. Boot it into CWM Recovery mode like this: press and hold Volume Up, Home and Power. Release the buttons when the screen powers ON and it tells you that you need to press again Volume Up to confirm that you wish to boot into CWM Recovery mode.
  6. Select ‘backup and restore’ option from the main menu of the Recovery mode. Create a full NANDROID backup of your current OS and this will set a restore point for the smartphone.
  7. Select ‘wipe data/ factory reset’ option. Confirm. NOTE: If the phone is already running on a previous build of CM 10.1 then you can skip this step and continue with the next one.
  8. Select ‘install zip from sdcard’ now. Then, from the new menu, select ‘choose zip from sdcard’. Find the ‘CM 10.1.0 RC1’ zip and confirm its installation.
  9. When the ROM is successfully installed, you should select once again ‘choose zip from sdcard’. Now, install the Gapps file and confirm the changes.
  10. When all the files have been flashed successfully, you have to return to the main CWM Recovery menu.
  11. Select ‘reboot system now’.
  12. Wait for your device to perform its first boot process with the new OS. This shouldn’t take more than 5 minutes to complete.
  13. Enter your Google account details and then you can begin to test all the new functions of your smartphone.

These were the steps that you had to take in order to make sure that you successfully flash the CyanogenMod 10.1 Release Candidate 1 nbuild on your T Mobile Samsung Galaxy S3 smartphones.

In case the device doesn’t complete the first boot process with this ROM in under 10 minutes or the device enters into a boot loop after installing the new ROM, then you will have to power off the phone completely by removing its battery. Re-insert the battery and then you need to repeat the entire tutorial once again. The second installation attempt should be applied completely, don’t skip step 7 actions.

If you don’t like how this new ROM works with your device, then you can easily restore it to its previous OS using the CWM Recovery menu and the ‘backup and restore’ option. Make sure to test all of its features before deciding to uninstall the CM 10.1 RC1 ROM.

Remember that this is one of the most popular and best Android 4.2.2 Jelly Bean ROMs. It is constantly updated with new builds and you can keep yours updated by using the Settings menu, and then opening the CyanogenMod Updates section. Select from the list of CM versions such as Nightlies, M, Release Candidates or Final builds, and then using a single tap you will download and flash the latest build for your smartphone.

If you have any other questions, then you can post them in the comments section and we will try to offer you the best solution possible.