OnePlus 2 is the 2015 flagship Android device of Chinese upstart OnePlus. It is the successor to the popular OnePlus One, and is due for release in Q3 2015. It features a 5.5″ 1080p LTPS LCD display, 1.8GHz octa-core Qualcomm Snapdragon 810 processor, 4GB of RAM and a 3300mAh battery. Internal storage comes in at either 16GB or 64GB. The rear camera has a 13MP sensor and is capable of 4K video recording at 30fps, while the front camera has a 5MP sensor and can record 1080p video.
OnePlus 2 runs on Oxygen OS which is a modified version of Android. If you are not a fan of Oxgen OS, you can install CM 12.1 ROM running on Android 5.1.1 on OnePlus 2. This is an unofficial version and official build can be expected in a few days. Meanwhile, you can install this build. Follow the detailed guide given below.