Galaxy S2 was launched in 2011. It is powered by a 1 GHz dual core processor and 1 GB RAM. It had 16/32 GB internal storage options which could be further expanded by 32 GB via microSD card. It also had a 8 MP rear camera and a 2 MP front facing camera. It originally ran on Android 2.3.4 and was later upgradable to Android 4.1.

Samsung Galaxy S2 was the device which really put Samsung on the map. It was one of the best devices launched at that time and there were record sales. But it has been long time since and the official support has stopped which means no Android updates. However CM 12.1 ROM is available for Galaxy S2 which will update this device to Android 5.1.1. Follow the guide below.

Galaxy S2

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 S2:

Requirements:

Steps to install CM 12.1 on S2:

  1. Create a Nandroid backup from recovery, in case anything goes wrong.
  2. Download the CM 12.1 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 12.1 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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