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The issue resolved itself after leaving the device turned off for a day. I'm still curious what caused it, though, and obviously i'd like to prevent it from happening again.

Hi all, I have an issue with a Mi4c: The device boots normally, lock screen appears, I can swipe to enter pin but then it turns black instantly again. I have to hit the power button twice to get back into lock screen. Swiping left to access camera also turns the screen black immediatly...