OnePlus One sports a 5.5″ 1080×1920 JDI display. It’s powered by a 2.5GHz Qualcomm Snapdragon 801 processor and 3GB of RAM. Storage comes in at either 16GB or 64GB. Other features include a 13MP camera, 3100mAh battery, dual front speakers and StyleSwap replaceable back covers. On the software side, the OnePlus One runs a version of Cyanogenmod with a unique modified user interface.

OnePlus One also comes with Oxygen OS in addition to modified Cyanogen OS. If you want other options, there are many custom ROMs. The official CM 12.1 ROM can be installed on OnePlus One. This is stock CM 12.1 and it varies from the modified Cyanogen OS present in OnePlus One. Follow the guide below.

OnePlus

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 OnePlus One:

Requirements:

Steps to install CM 12.1 ROM on OnePlus One:

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