Q: M

I recently got a MacBook Air from someone who owed me money. The MacBook Air is completely locked and Im not sure how to bypass the secured login screen or which code to use that will boot in an alternative mode. I've tried Command + R, Command + S, Option and none of these three worked. When I press Command + R, I get the following lock screen (the picture is just upside down, not sure why.)

  I own a macbook pro and have reset my password using Command+R. Not sure if MacBook Airs need a different command. When I press Command+S I get a loading screen, then a screen that tells me "Your computer is disabled. Try Again in 60 minutes"

What command can I press to bypass this?

Could I put a clean OS on a USB drive and install it that way to have a clean install? If so, how do I boot it, if I can only get to these screens?

Please help!!!!

Also, not sure which OS its running since I can't get pass this to fully inspect the Macbook Air.