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Hi there and welcome to Just Answer, my name is Richard and I look forward to helping you.
I’m sorry to hear you're having trouble. I know that can be frustrating. Hopefully, we can get this resolved quickly.
To do the reset
Once all data is backed up (make sure it is to avoid losing your data), then please go to settings, search at the top for Factory Reset and select it.
Complete the reset, then setup the phone again and once done, tell me if it now functions correctly.
Let me know the results please.