Updated to Ventura, locked out of device

Reset Computer Password  for the Administrator Account Password

Intel Computer

1 - Shutdown the computer 

1A - Restart computer and immediately hold the two keyboard combo Command  r 

1B - Because this is a Headless machine the below 1C is import for this special circumstance

1C - If using a Bluetooth Keyboard with Rechargeable Battery - Cable the Keyboard to computer for this unique purpose. Bluetooth Kernel may not load soon enough to execute the 2 keyboard commands 

2 - Top Tool Bar >> Utilities >> Terminal

3 - Type resetpassword as one word and no spaces

4 - Press Return key

5 - Follow the prompts and remember the New Password

Try the password of the initial user account of this machine. It is probably the one allowed to unlock FileVault.

Buying Second Hand

This is what the Original Owner Should have Done before selling

What to do before you sell, give away, or trade in your Mac - Apple Support (CA)

If Not, you either Return to them for Full Refund

Or you are left with having to do it yourself, sadly

Please 😔 disregard pervious posting