Install CM10.1 Nightly Android 4.2.2 on T-Mobile Galaxy S3 SGH-T999 – 15 March

Author Photo
Mar 15, 2013

The CyanogenMod team has made available; CM10.1 Android 4.2.2 Jelly Bean for T-Mobile Galaxy S3 SGH-T999. And this build from the CyanogenMod team includes support for a variety of phones, including the T-Mobile Galaxy S3 SGH-T999. The latest nightly build is based on Android 4.2.2 Jelly Bean ROM and will allow you to enjoy the latest iteration of Android 4.2.2 Jelly Bean on your T-Mobile Galaxy S3 SGH-T999.

Before installing this ROM, it is pertinent to mention that ROM flashing can cause your phone to brick. While, the majority of ROMs today prevent your device from getting bricked, it is still advisable to practice caution. Because it will be your responsibility in the event of your device getting bricked.


  1. CM 10.1 Nightly-Build 4.2.2 Jelly Bean ROM For T-Mobile Galaxy S3 SGH-T999 [File:]
  2. Google Apps [File:]

Install CM10.1 Nightly Android 4.2.2 on T-Mobile Galaxy S3 SGH-T999 – 15 March

  1. Connect your T-Mobile Galaxy S3 SGH-T999 with the PC, via USB cable.
  2. Download the afore mentioned CM10.1 Android 4.2.2 Jelly Bean Nightly file and copy it to the SD card of your phone.
  3. Disconnect your phone and switch it off. And make sure that you wait 5-6 seconds to complete the power down cycle.
  4. Now, you will boot the T-Mobile Galaxy S3 SGH-T999 into recovery mode, by pressing and holding down the Volume Up button, alongside Home and the Power button, until the screen flashes, release the three buttons then. After a few seconds of that, the phone will enter recovery mode.
  5. Once in the recovery mode, take a Nandroid backup of your existing ROM. This is necessary, to enable you to recover your current ROM install, just in case the new ROM does not perform according to your liking. In order 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. Once done, select wipe data/factory reset, select ‘Yes’ on next screen to confirm your action. Wait for a few minutes until the phone wipes your data. Once complete, go back to CWM recovery menu and Wipe Cache Partition and then Wipe Dalvik Cache.
  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 phone finishes installing the ROM, you need to re-do step 7, but choose file instead of ROM zip to install the Google apps package.
  9. When GApps get installed, go back to the main recovery menu and select reboot system now to reboot the phone and boot up into customized Android 4.2.2 Jelly Bean ROM CM 10.1 Nightly-build. The first boot will take time, so be patient!

You are now running latest CM 10.1 Nightly-build Android 4.2.2 Jelly Bean ROM on T-Mobile Galaxy S3 SGH-T999. If you are facing any issues, feel free to mention it in our comments section.