Board Thread:General Discussion/@comment-39828670-20190725160534/@comment-1038387-20190725165801

Users aren't unblocked because they (or someone else) asks for it. If they're blocked on a wiki, they have to contact the admin that blocked them, on their wall here on Community Central.

That user would have to be polite and nonconfrontational, as that admin is the only one who can unblock your friend.