I made the change of the block stops because my speaker was disrespectful as well as the front block because the speaker was defective. The phone starts perfectly. There are 2 problems:
1) The photos of my BV8000 pro are blurred on the middle, the focus is not done. You have to tap or shake it to get it in focus.
2) The phone network gets lost sometimes, but the wifi and data connection works.
What can I do ?

thank you very much

Tony