Fireboard to PHPBB3

Looking for someone to convert my Fireboard forum to PHPBB3 (I think this means converting first to SMF and then PHPBB2, then PHPBB3 or anyway you know how). It is imperative that existing posts on the site are not lost and that username and passwords are moved over. Login is via community builder and this is to remain the same, only forum needs changing as Fireboard is messing up. Need this done asap.