Cannot login as "Noname" after installing Macosx Big Sur

dougtas wrote:

I stopped using a 2016 macbook pro and was going to sell it. I wiped it of data and reinstalled Big Sur. Unfortunately, I left the laptop to sit for several months and I think the battery went flat. Now when I try to start it up, it wants me to log in as "Noname" and I don't know what the password is. I have no data I want to keep, but can't work out how to login or create a new admin account. I've tried all sorts of restart sequences, but it always wants me to log in as "Noname".

See if there is anything here—

What to do before you sell, give away, or trade in your Mac