Bitcoin Forum

One of my friends account was hacked for two days. He got it back with the security question. But suddenly he got banned on this forum. He thinks that the hacker make some fault with this account. Now he wants to get it back. How can he remove his ban?

You should try to contact theymos and ask him.

You'd be better posting this in the Meta sub-forum where they can have a good laugh...err... consider your request. I'll report it for you so it may be moved.

Firstly you need to find out if It's permanent or not, if It isn't just wait.

I am afraid he can't get his ban removed.
Otherwise, all the other users getting banned may ask for an un-ban as well by claiming to be hacked.

I think a sudden email change + password change + recovery using security question would be able to prove he was hacked.

If it was a trivial offence : "Posts with low value" or something like that, you may be pardoned, on the grounds that you might've been hacked.
If it was something terrible and huge, well, the ban won't be repealed.

Maybe in a one off situation, but you need to consider that if we started doing it that way regularly, it would start being abused pretty quickly. Which is part of the reason I rarely post why I do this or that, or why I didn't.