This usually happens if the original PBP was "multi-disc" (e.g., Metal Gear Solid or Final Fantasy IX ). When extracting a multi-disc PBP, PSX2PSP may extract them as separate files. Ensure you are patching the correct disc. "Black screen after patching"

Use a patcher like (for .ips files) or xdelta UI (for .xdelta files).

An ISO is a raw sector-by-sector copy of an optical disc. Emulators love ISOs because they are "dumb" files—no abstraction, just raw data.

Most ROM hacking tools and patches are designed for the original disc image formats ( BIN/CUE or ISO ). While PBP files are great for saving space on a PSP because they are compressed, they are "wrapped" in a Sony-proprietary container that prevents most patching tools from reading the game data correctly. Best Tools for Conversion

: If the PBP contains multiple discs, some unpackers may only extract the first one. Use PSX2PSP to ensure all discs are handled.

If the PBP contains multiple discs (Eboot.pbp with multi-disc support):