There are four US variants of Samsung Galaxy S3 and official CyanogenMod 10 (CM10) is now available for three of them, Sprint Galaxy S3, AT&T Galaxy S3 and now also for T-Mobile T999 Galaxy S3. Not a while ago, just on the release of Jelly Bean AOSP source code, the guy behind CyanogenMod said that he’ll bring Android 4.1 Jelly Bean based CyanogenMod 10 soon and he is true on his words.
CyanogenMod 10 is completely AOSP based custom ROM that gives you stock Android experience. However this is just a preview build that still has some bugs like camera preview turns green during animations and it also may crash.
Read on how to install CyanogenMod 10 (CM10) on your T-Mobile Galaxy S3 but first do keep in mind that just use ClockworkMod recovery to install CyanogenMod 10, follow our guide to install ClockworkMod or use all-in-one toolkit. Make a backup of your device data such as SMS, internet setting, contacts music files etc because the below procedure may wipe data, you can sync your contacts with Gmail account and for messages use SMS apps, lastly use file expert app to backup apps.
DISCLAIMER: Please proceed the below guide at your own risk, Android Egis will not be held responsible if your device lost data or get damaged following this guide.
Step #2: Copy download .zip files to the SD card of phone. Place under internal SD card not only external SD card.
Step #3: Power off phone and put it into recovery, to do so reboot the device by holding down volume, home and power buttons.
Step #4: In recovery mode, make a nandroid backup of your current ROM, it’s very important, the reason is that it will take you back to your current state. To create backup select “Backup and Restore”, and then select “Backup” again.
Step #5: Perform wipe, to do so, select the wipe data/factory reset, and confirm on the next screen.
Step #6: Now you need to install the CyanogenMod 10 .zip file, simply select “Install Zip from SD Card” then “Choose Zip from SD Card” and locate the downloaded ROM file.
Step #7: After ROM installation, also install Google Apps in the same manner.
Step #8: Once the installation is completed, select “Go Back” after that select “Reboot System Now.”
That’s it, you’re done, whenever you need to go back, put the smartphone in recovery mode and restore the back. Comment below for queries and you can also visit the original thread link given in step 1.