What is a KV?
KV is Short for KeyVault. KV is pretty much your console on a file, if microsoft ever bans your xbox, they ban your KV. On JTAGS you can replace the KV when its banned to unban it. You can take the KV out of a normal xbox or you can buy them from people that take KV's out of normal Xbox's and replace them on your JTAG and you will be unbanned! You cannot replace the KV on a normal XBOX.