I downloaded Dissidia: Final Fantasy just a few days ago and when I opened the rar. file, contained was a folder call "PSP_GAME" and a UMD DATA bin file. inside the folder was 2 folders: SYSDIR, USRDIR, the 480 x 272 pic and icon, sfo and at3 file. I put the main file and UMD DATA into my ISO folder, and other different variations but nothing works it only takes up space. maybe i need a umd emulator, devhook, or fastloader idk. please help, any advice would be greatly appreciated.
Drag and drop the PSP_Game folder and the UMD_Data.bin in the right-hand panel.
Then clicked save at the top, and save it as a CSO.
Now put it into your ISO folder on the root of your psp card.
Launch the game from the memory card in the game menu.
PS: If you don't care about the storyline (because it's in japanese anyway) you can save a lot of space by replacing the Movies folder (USRDIR->DATA->MOVIES) with this (unzip it first):
