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.
While OnePlus One has not received the Android 5.0 update, users can taste Lollipop via different custom ROMs. One custom ROM available is the BlissPop ROM which offers high level of customization and it is based on the CM 12 ROM. If you want to install this ROM, follow the guide given below.