Im just wondering if its worth replacing the laser of just flash the dvd key to a spare hitachi 47 both are but have a spare from a friend and my own hitachi is failing to read backups would this be the laser dying out they stickers both say 47 but it has DJ, DH does this make a difference ? and i play a backup game on one xbox does that mean i have to burn another to play it on a different xbox since it updated with the title update?