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okay, this sounds like it is still locked to the previous owners google account. You can try these sreps to unlock it>
Enable developer options (by tapping the version code in About Phone), then go into Developer Options and turn on USB debugging. Connect your device to a PC with ADB installed (from here) and run this in a shell window:
adb shell content insert --uri content://settings/secure --bind name:s:user_setup_complete --bind value:s:1
Now you can go into Settings and do a Factory Reset.
okay, I am out of ideas on this. I will open the question to our other experts.
Hi there and welcome
Did you recently reset the password ***** your Google account that was used on the phone?