I tried porting CM12.1 from a kingzone and cubot devices (they have released the source) with mixed success the Cubot rom worked well but the camera was stuck in 5M resolution and the screen leeched the battery dry, the kiingzone rom had hardware issues almost none of the sensors worked
Crown has good hardware it would be a shame not to use newer android on it.
it's also disappointing mediatek released lollypop for mt6582 but not for mt6592
My device is relatively new and is still under warranty, I was a total noob when I got my blackview I love the quality of the hardware just disappointed it's abandoned this is my first android device.