Marco had just downloaded a PS3 game as an ISO file — “Dragon’s Crown” — but his jailbroken console’s Blu-ray drive was on its last legs. Every time he tried to mount the ISO in multiman, the fan would roar, and the game would stutter. He needed a cleaner solution: install it directly from the XMB as a PKG file.
Sign or adapt the package (if creating .pkg): how to convert iso to pkg ps3 better