Tough position to be in. I've had this happen before, but it was my fault because I was doing crazy stuff to my phone. Try the usual sot reset, but don't get your hopes up too much.
Hard reset might be your only option here. BUT do you have your memory card encrypted by the phone? If so, a hard reset will cause you to lose everything since the encryption key is kinda like a hash of your phone's serial number and your lock code.
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