Tablet Stuck on Lightning bolt Icon when Charging, and Screen flickers

Recently got this Tablet from a Friend, said it isn’t Woking and if I can fix it, I can have it. The Problem with the Tablet is, that when you try to charge it, it’s just stuck on the Lightning Bolt Icon, and the screen Flickers.
I Already have tried all Button Combinations I could find, but it didn’t help.

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