Yes i confirm if you were already be banned then you will not be able to join server.
correct. it works if you are not be banned to start with ( if you are not be banned and join a server and get be banned you can go straight back in using this hack ) . if you are allready be banned then no it will not.
to unban an allready banned account on be .... look for the packet that sends your key and fake it.
be also sends drive info so possibly changing your hard drive serial or turning smart off could bypass it.
i seem to be the one doing all the work , maybe someone else could answer these questions?