I bought a used MacBook Pro recently and I'm trying to factory reset but can't because it seem to have a firmware password (a screen with a lock on it asking for the password). 
I emailed the seller and he said he factory reset it and doesn't remember putting any other passwords in but the password used to log in.
I know I have to have proof of ownership but can I prove it if I bought it online?
What can I do to bypass this problem?
	
		
			
		
		
	
				
			I emailed the seller and he said he factory reset it and doesn't remember putting any other passwords in but the password used to log in.
I know I have to have proof of ownership but can I prove it if I bought it online?
What can I do to bypass this problem?
 
 
		 
 
		 
 
		 
 
		 
			 
			 
 
		 
 
		 
 
		 
 
		 
 
		 
			 
 
		