How to Install Cyanogen OS 12.1 Android 5.1.1 Lollipop on OnePlus One.

OnePlus One Cyanogen OS 12.1 custom ROM comes with tons of new features and is based on Android 5.1.1 Lollipop with the all new Material Design. Several new apps have been redesigned and perform a lot faster on this phone. This update brings the following changes to your OnePlus One software:

•Bug fixes
•Performance improvements…

÷ Prerequisites:

•This tutorial is only for installing Cyanogen OS 12.1 YOG40PAS2QLsoftware update on OnePlus One.

•Your phone should have a customrecovery installed.

•Your phone should be on Cyanogen OS 12.1 YOG4PAS1N0 before installing this new incremental update.

•This tutorial will wipe out all your data.

•Make sure you backup all your data in your phone before proceeding. If you do not want to wipe any data, skip step 6.

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 *Disclaimer:

Android Custom ROM fix ® provide various Firmware Updates and Rooting process along with Custom ROM,Modes,file are all belong  to their owners/developers. The autor of this site or the developers are not responsible,  if you damage or brick your device.Do it on your own risk and follow the instruction properly.

÷ How to Install Cyanogen OS 12.1 Android 5.1.1 Lollipop on OnePlus One.


Step 1 – Download Cyanogen OS 12.1 YOG40PAS2QL ROM for One to your computer.

Step 2 – Connect and mount your One USB memory to your computer using the USB cable.

Step 3 – Now copy/paste the downloadedCyanogen OS 12.1 ROM zip file to your phone memory / SD card. Make sure the file is in the phone memory / SD card root (not in any folder).

Step 4 – Then turn OFF your phone and disconnect from the USB cable.

Step 5 – Now to get in the Recovery Mode. Switch ON the phone while pressing and holding Volume Down + Power buttons together.

Step 6 – Once you are in TWRP Recovery, perform a full data wipe by tapping on the ‘Wipe’ button. Then swipe on the “Swipe to Factory Reset” option at the bottom.

Step 7 – Now go back to the main menu and then tap on the ‘Install’ button. From the list, choose the ZIP file that you copied to your phone memory in Step 3.

Step 8 – Confirm installation on the next screen by swiping on the “Swipe to Confirm Flash” option. The installation procedure should start now.


Step 9 – Once the installation is completed.

Step 10 – You can now reboot your phone by selecting the “Reboot System” button.

Your One will boot now and it might take about 5 minutes to boot on your first time. So, please wait.

That’s it! Your OnePlus One should now have Cyanogen OS 12.1 YOG40PAS2QL Android 5.1.1 Lollipop official software updateinstalled on your phone! Go to Settings > About phone to verify.