BASIC INJECTION TUTORIAL:

You will need:



Start here:

Replacing the game:

OPTIONAL Making your own homebrew ISO:

Stripping out unneeded files:



Rebuilding the FPKG:



Original post

Spoiler

I noticed recently that the PSP remaster of Parappa the Rappa was indeed a PSP emulator very similar in structure to the PS2 classics one we know and love.



This thread will document findings and informations based on this subject only, and this thread will evolve to turn (hopefully) into a tutorial for injecting your own isos and playing PSP on PS4!



Lets start with Basic info:



UMDGEN 4.00 generates same files as the ones found in CUSA05289_00's IMG.



The MD5 of the main game file USER_L0.IMG is F2C73AA0EF2E326C128929230D08678A which matches that of the one found in the PSY-PTRU.ISO release.



The PRX files libscefios.prx and libc.prx mirror those required for PS2 classics, perhaps we can use those patched versions of those files in this method to make accepted injected pkgs.



The ps4 pkg contains configuration for texture swaps, this will need to be commented out to allow a different game to be injected.



Stay tuned for much MUCH more..



Edit new info:

USER_L0.IMG might have a limit of 880mb = TBC.



Iso is not compressed.



Master disc format might be required to pkg game.



Might be possible to swap isos via ftp or placeholder app... watch this space.



IIRC I saw option to dump textures meaning it might be possible to make custom texture packs.