OnePlus One was launched in early 2014. It has 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 stereo speakers and StyleSwap replaceable back covers. It runs on Android 4.4.2 OS.
OnePlus One runs on the version of CyanogenMod which has a unique interface. If you want to run it on stock CyanogenMod you can install the CM11 custom ROM. Besides, it will also have the latest Android 4.4.4 OS. Follow the steps given below to install it on the OnePlus One.