black screen on lumia 640xl after latest guild updated

If hard resets didn't help, I think we may need to use the WDRT, although make sure the phone has power.
 
Go to All Settings–>System–>Battery Saver.
Tap on Battery use
Choose Windows Default Lock Screen App to Always Run Background
Hope this helps
 

Members online

Forum statistics

Threads
338,659
Messages
2,261,675
Members
428,743
Latest member
joseeduardo