I bought a new MacBook Pro 16" from a guy on offer up and he had it all back to the factory settings main page so I signed in and set up Mac for myself but then when I got home I decided to restore it one more time just to re enter passwords and add Siri and stuff like that. So I restarted and held Command + R and erased the drive but then the computer restarted before I was able to do anything else and now its asking for his Apple ID and he's not responding to me Can someone help me get past this so I can restore my Mac again?