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Please Backup all your data (Photos, Videos, Documents ect....) and do a Hard reset :
Additional information : https://www.youtube.com/watch?v=7EVDXR8SYds
Let me know if you need further help
If you can access to the phone screen, pease follow the steps below :
Please turn the phone off, remove the battery then press/hold down volume down and power button and try hard reset again, let me know the results
Can you try Hard reset while you charging the phone please
Press and hold all the 3 buttons (volume up, down and power) at the same time, wait a few seconds, the phone should turn itself off and you can then restart it.
Hope it works out, if the problem persists please reply back to me
Take your time please, if you need further assistance please reply back to me and i will gladly continue to help