Oneplus one is a great Smartphone which create a buzz all over the world in the Smartphone market. The best thing about the OnePlus One is it came with a pre-installed CM11s and was the reason why the phone was in demand even before it was launched. Finally at the moment where Cyanogen has released the CM12 Lollipop and OnePlus One will be the FIRST phone to receive the OTAs officially. The ROM comes with lots of new features and improvements and this one is not the CUstom ROM, it’s the officiall one and only for the Oneplus one users.


Most of the users already received the OTA updated on their devices and enjoying the new Lollipop on the device. So in this article we’ll show you how you can easily install the latest CM12S update manually on your Oneplus one. Alright enough of talking lets roll you down to the instructions.


  • Proceed with extreme caution and follow each step correctly.
  • Back up all of your data (just in case, and always safe to be cautious than sorry!).
  • Make sure your phone is charged.

Install CM12S On OnePlus One Android

If you have a OnePlus One smartphone then you are just a few steps away from installing the CM12S on your OnePlus One. So follow the below steps to Update your OnePlus One using the OTA update feature.

Install CM12S On OnePlus One Android Smartphone

  • At first go to the settings app.
  • Now click on about device
  • Now click on check for updates.
  • So, if you find any update available then download and install the update. If you not find any update then oneplus hasn’t pushed the CM12S OTA update for your region or phone.

Another way to Install CM12S On OnePlus One Android

If you are unable to download CM12S OTA update for your OnePlus One then don’t worry we have another way through which you could manually flash the CM12S OTA zip file on your OnePlus One Smartphone, below are the steps listed.

  • First of all, you need to enable Developer Options. To do this, go into Settings -> About Phone -> and tap the build number 7-10 times. You would now have developer options enabled.
  • At first download CM12S ROM from here. {Official link} {Mirror link}
  • Don’t extract the folder.
  • Transfer the file to the root directory of your phone’s internal storage.
  • Now you need to flash this file manually form the recovery mode.

Note: The guide assumes that you already have a Custom Recovery installed in your OnePlus One. If you don’t have a recovery installed in your OnePlus One then you won’t be able to flash the CM12S, hence it is recommended to install a Custom Recovery in your OnePlus One.

  • Reboot into TWRP recovery – Press and hold the Power+Volume Down button simultaneously and release once you see the OnePlus logo.
  • Once you are in recovery mode clear cache, dalvik cache and data (not compulsory but to reduce errors from happening).
  • If running Oxygen OS then Select Wipe > Advanced Wipe > Select “Dalvik cache, System, Data and Cache“. Then swipe to wipe.
  • Now it’s time to flash CM12S on your oneplus one smartphone.
  • Go back to Home screen and locate the CM12S zip that you moved on your phone internal storage and Select the CM12S OTA Zip File and flash it.
  • One the flashing process is done. Reboot to system.
  • Reboot your OnePlus One and the first boot will take some time but have patience and let your phone to boot.

That’s it now your oneplus one is running new CM12S ROM.


I hope you like this article how to install CMS12S rom on oneplus one android smartphone. If you have any problem then hare with us by a comment.

This is the entire method for install CMS12S rom on oneplus one android smartphone. This whole procedure takes five minutes to be completed. I hope this can be terribly useful for you. If you found this install CMS12S rom on oneplus one android smartphone tutorial helpful for you then share your comments with us and share this article on social media along with your friends.


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