I recently bought a iMac (Retina 5K, 27-inch, 2020) originally was working I wanted to reformat the hard drive and erase everything. After doing so I get a error message wants me to put in the old password but I don’t know it. My friend is a IT person and told me you got burned the computer is basically scrap now. The guy I bought it from used it for work he quite when the company went out of business he says he never had a password. I hate to throw it as I paid quite a bit of money. Any suggestions on getting it working again I have attached a picture of the error message it is giving me. I contacted Apple they really weren’t any help they had me do the same thing that I intended to do