After the update on my phone, C9 pro, the sensors on my phone stoped working. I have difficulties in adjusting bright of my screen even when it is auto. the intensity of the screen doesn't change even after changing the dial manually(in auto). The gy...

I do have a problem playing videos and songs on this device. When I plug in my earphones there is no audio output but it indicates that the media is playing. secondly about playing a video, the fps is too slow like it's almost slowed down to half and...