Hi, 
Because my screen didn't shut down during call, I tried this for my Blackview BV7000 pro by on Amazon : 
Calibrate your Proximity sensor in engineer mode:
- type *#9646633# into the keypad of the phone app
- go to tab "Hardware Testing"
- open "sensor > Light proximity sensor > PS Calibration > Calibration > do calibration
But an error message appear : "Calibration failed". 
Can you help me please ? 
Thanks !
			
									
									
						