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Got one of these Umidigi A9's. It's good, but the proximity sensor doesn't work. The screen is always black during a phone call, and it is impossible to hang up.
If I shake the phone very hard, sometimes it works again for a second. I think there is a disconnected wire inside!
I have already cleaned glass, removed case and screen protector and tested in bright light and a dark room.
How to fix?
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