To run the port on a Vita, you generally need a jailbroken console, the loader, and the original and data files from the Android version (v1.1.33).

A transition from a 1.5GB ISO to a sub-1GB CSO.

You're looking for a review of the Dead Space PSP ROM repack!

Toggle between a smooth 60 FPS for fluid combat or a cinematic 25 FPS lock to recreate the gritty, overambitious feel of original hardware pushing its limits.

Usually a fake download or a low-quality homebrew demo. The real game was never coded for the PSP's MIPS architecture. "Direct Android Port"