Samsung Galaxy S3 has a 4.8″ 720p display. It also was the first device to have a quad-core Exynos 4412 processor, with each core clocked at a maximum 1.4 GHz. It packs NFC, wireless charging capability, and the latest wireless radios. It ships with Samsung’s Nature UX interface. At the time of its launch, it ran on Android 4.0.4 ICS.

CyanogenMod team have been successful in developing the CM 12 custom ROM for the Galaxy S3. The ROM is still in the development stages but you can try it out on your device. Follow the guide given below.


Disclaimer: Follow the instructions at your own risk. If the device gets damaged, the writer or the owner of the site must not be held responsible.

Pre-requisites and Backing up your S3:


Steps to install CM 12 ROM on S3:

  1. Create a Nandroid backup from recovery, in case anything goes wrong.
  2. Download the CM 12 ROM zip file and Gapps zip file and transfer it to the phone.
  3. Switch off the phone and boot the phone into Recovery mode.
  4. Next, wipe the cache and the dalvik cache.
  5. Now go to “Install zip” and then “Select zip”. Choose the CM 12 ROM zip file.
  6. Now again clear cache and dalvik cache.
  7. Go to ”Install zip”, then “Select zip”. Choose the Gapps zip file.
  8. Then perform full data wipe task. To do so, click “Wipe Data/Factory Reset”, then choose “Yes” on next screen to confirm.
  9. After the process is complete, reboot the phone.

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