If you have tried everything else to fix resolve this issue, but unsuccessfully, consider resetting the device to its factory settings. Before you reset it, make sure to back up your personal files, preferably to a computer, to avoid losing them.
If you are not sure how to reset your device, check out the don't know how to reset my device guide.
If you don’t receive the email in the next 2 minutes please check your junk folder, and add [email protected] to your safe sender list.