Activation Lock on MacBook
Hello, please answer, I was selling a MacBook, the buyer asked me to log out of my account and go to his Apple ID, I suspected that if I did this, I would most likely lose access to the MacBook, but he assured me that if I press the button for additional functions, then he will enter the system as a guest. After gaining access to the poppy, he blocked it as stolen.I am the second owner, I have no receipt and box .
I know that I myself am to blame for what happened, tell me how to restore access to the Mac and enter my Apple ID.
I'm from Ukraine .
[Personal Information Edited by Moderator]
MacBook Pro 13″, macOS 11.5