Oppo Find 7a is the successor to the Oppo Find 5. It has a 5.5in, 2K screen, Snapdragon 801 processor and 3GB of RAM. It also has a 13MP camera that shoots 4K video. At the time of its release it ran on Android 4.3.
Oppo Find 7a did not receive official Android 5.1.1 update but you can still update Find 7a to Android 5.1.1 using custom ROMs. CM 12.1 is available for Find 7a which will update Find 7a to Android 5.1.1 Lollipop. Follow the guide below.