Install CM10.1 M1 Android 4.2.1 Jelly Bean on AT&T Galaxy S3 I747

Feb 2, 2013

The CyanogenMod Team has recently released their first ROM for AT&T Galaxy S3 I747. The latest CM10.1 monthly build is based on Android 4.2.1 Jelly Bean ROM, it will allow you to enjoy the latest iteration of Android 4.2.1 Jelly Bean your AT&T Galaxy S3 I747. While the development of Android 4.2.1 Jelly Bean started late but we are sure you will like the CM10.1 release.

So, cutting the long story short, here is how you can update your Galaxy S3 I747.

Before installing this ROM, it is pertinent to mention that ROM flashing can cause your phone to brick. Although most of the ROMs today are virtually brick proof, but it is always recommended to be cautious since it will be your own responsibility if anything goes wrong.


  1. CM10.1 M1-build Android 4.2.1 Jelly Bean ROM For Galaxy S3 I747 [File:]
  2. Google Apps [File:]

Install CM10.1 M1 Android 4.2.1 Jelly Bean on AT&T Galaxy S3 I747

  1. Connect your phone to PC using USB cable.
  2. Copy downloaded files to the SD card of your phone. Important: Don’t extract any files.
  3. Disconnect USB and then turn off your phone.
  4. Boot into recovery mode. To do so, press and hold Volume Up, Home and the Power button, continue to hold all three until the screen flashes, then release all buttons.
  5. Perform a Nandroid backup of your existing ROM, so that you can recover your current install if the new ROM does not perform satisfactorily for you. To perform a backup, select Backup and Restore, then on the next screen, select Backup again. Go back to main recovery menu after backup is complete.
  6. Now, select wipe data/factory reset, select ‘Yes’ on next screen to confirm your action. Wait few minutes till the data wipe is complete. Now come back to CWM recovery main menu. Select wipe cache partition and after wiping process done, select Wipe Dalvik Cache under advance option to perform Dalvik cache wiping.
  7. Select install zip from sdcard, then select choose zip from sdcard. Now, locate the file that you copied earlier in Step 2 and select it by pressing Power button. Confirm installation by selecting Yes. Install the said zip file on the next screen. The ROM installation will begin.
  8. Once the ROM installation process end, repeat the step 7 but choose the file instead of ROM zip to install the Google apps package.
  9. When installation is completed, go back to the main recovery menu and select reboot system now to reboot the phone and boot up into customized Android 4.2.1 Jelly Bean ROM CM 10.1 M1-build. The first boot will take time, so be patient!

You are now running CM 10.1 M1-build Android 4.2.1 Jelly Bean ROM on AT&T Galaxy S3 I747. If you are facing any issues, feel free to mention it in our comments section.