I suggest not using this option for the emulator after you DECRYPT the game image. The 'prometheus patch' is just a loader to prevent freezes. the 'PATCH VERSION' apparently had no effect, but the 'prometheus patch' just causes the emulator to hang. I went back and tested the game dumps with JPCSP. I also checked the YES to the 'PATCH VERSION', option you are given when first DECRYPTING your game image. Then i 'prometheus' patched both games (first selecting NO to patch the older version. I updated my firmware to 5.00 m33-6 on my PSP-FAT.

And Ys's boots but freezes at the boat, and Persona 3 hangs at the loading screen. I was recently testing some of the newer firmware games on the emulator, and my psp 3.90 m33 cfw, to try and troubleshoot the games. Just copy your game image to your computer and your ready to play. Your game is now DECRYPTED, and ready to play in jpcsp emulator. The select 'EBOOT decrypt', then 'backup NO', enable version patch NO (however depending on the game this probably won't matter, and doesn't seem to affect the emulator, I will test some known working encrypted games later and correct this instruction if necessary, so far it doesn't seem to bother the emulator).Ĥ. Select the 'Iso_Tool' program from your psp's options menu then select the game you want to DECRYPT. Dump your UMD game, to your psp, and put it in your 'ISO' folder.ģ. Download 'Iso_Tool 1.74' from google, and put it in your 'GAMES' folder in your psp.Ģ. You obviously need some kind of custom firmware (cfw) installed, and a tool battery/memory card to do it with.ġ. Make sure your PSP can run homebrew, depending on the psp model and firmware combination some psp cannot run homebrew, until you change your firmware either by upgrading or downgrading.

Decrypting psp iso for jpcsp