The only way to remove the ban flag is if you have a backup of your NAND prior to the ban, if you dont know what that means or are unsure, you probably don't. This only removes the ban flag, you then have to remove it from the HDD so your profile/game copies wont be corrupt. You can only remove the flag, once you reconnect the ethernet, you will be banned again. There is no such thing as unbanning, and if someone says otherwise, they are full of shit.