My aunt has a 2015 Macbook Air, that she purchased as a referb in 2020. The computer had Catilina on it, and she needed a newer OS to run a certain peice of software. To upgrade to Montery, I had to reformat the HFS hard-drive as APFS. After doing this, I installed Monterery. Now it imideaetly asks me for a passowrd to sign in. (which i never set on installation). If I go to recover mode, or even try to boot off an external drive. It gives me a black lock screen with nothing but a password input. Presumably, this was a firmware password from the previous owner, that someone still existed on the computer after it was refurbished. Where do I go from here?