How To Install CM10.1 RC2 Android 4.2.2 Jelly Bean For Samsung Galaxy S3 SGH-T999


Step By Step Guides To Install CM10.1 RC2 Android 4.2.2 Jelly Bean On Samsung Galaxy S3 SGH-T999

This tutorial are detailed step-by-step instructions guide on how to install CM10.1RC2 Android 4.2.2 Jelly Bean custom firmware on T-Mobile Galaxy S3 SGH-T999. If you are used to installing custom ROMs on your Samsung Galaxy S3 SGH-T999, then this should not be any different for you.

If you beginners, you need to root your Samsung T-Mobile Galaxy S3 and install a custom recovery. Please see other guides before begin, or you can use search engine to find related web if you are unsure and make sure you read the tutorial once before actually performing it on your device.

Samsung Galaxy S3 SGH-T999

Remember :

  • This tutorial is only for installing CM10.1 RC2 Android 4.2.2 ROM on T-Mobile Galaxy S3 SGH-T999. Please do not try on any other Galaxy S3 variants.
  • Your phone should be rooted and have ClockworkMod recovery installed from before.
  • This tutorial will wipe out all your data. Proceed at your own risk.
  • Perform a Dalvik Cache wipe before proceeding from the recovery mode.
  • Samsung KIES will NOT detect your phone after installing this ROM because it is a custom firmware.
  • Make sure you backup all your data in your phone before proceeding.

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Steps To Do :

  1. Download CM10.1 RC2 Android 4.2.2 ROM and Google Apps for Galaxy S3 to your computer.
  2. Connect and mount your Galaxy S3 USB memory on your computer using the USB cable.
  3. Now copy/paste the downloaded Android 4.2.2 ROM zip and Google Apps zip filesto your SD card. Make sure the files are in the SD card root (not in any folder).
  4. Then turn OFF your phone and disconnect from the USB cable.
  5. Now to get in the Recovery Mode. Switch ON the phone while pressing and holding Volume Up + Home + Power buttons together.
  6. Once you are in ClockworkMod Recovery, select perform a full data wipe by selecting “wipe data/factory reset” as shown below. Use the Power button to select everything while in the Recovery Mode.
  7. Then, perform a cache wipe by selecting “wipe cache partition” .
  8. Now this is optional, but it is recommended to perform a wipe of your dalvik cache as well. You will not get into boot loops or any other errors. From CWM recovery, go to ‘advanced’ and then select “wipe dalvik cache”.
  9. Then go back to the main recovery screen and select “install zip from SD card”.
  10. Now select “choose zip from sdcard”. Using your volume keys, navigate to theAndroid 4.2.2 ROM zip file that you copied to your SD card and select it using the Power button. Confirm the installation on the next screen and the installation procedure shouldstart now.
  11. After the installation completes, go to “+++++Go Back+++++” and reboot the phone by selecting “reboot system now” from the recovery menu as show below.

Now, please wait, your T-Mobile Galaxy S3 SGH-T999 will boot for about 5 minutes on first time. After that, you can see different on your device.


All the custom ROMs and firmwares, official software updates, tools, mods or anything mentioned in the tutorial belong to their respective owners or developers. We or the developers are not to be held responsible if you damage or brick your device. We don’t have you on gun point to try out this tutorial.

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