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can i play god of war demo without decrypt iso?i know that full game needs to be decrypt and i have not psp to decrypt them so plz reply me.

Well, if the game needs decrypting, you must find a real PSP to do it.

i m asking that can i load it without decrypt iso bcz many games need it first on jpcsp

Not many, but some yes! Did you try loading it?

yes i tried to load it but after jpcsp crash

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and also tell me why we need to decrypt iso first.

I don't know myself, but I think we need to do it, because there's some kind of code that isn't in the JPCSP, or the emulator can't reach some info without decrypting.

so soon after will jpcsp able to run games without decrypt them

JPCSP !!!RUNS!!! a lot of games without decrypting.

All games have a main boot file that tells the PSP what to do and which files to load. JPCSP, like a PSP, interprets this file for the same purpose, but sometimes, and in most recent games, we can't access it because it's encrypted.
What prevents us from decrypting that file, is the fact that no one knows how to decrypt them and it's not easy at all to figure it out. The PSP uses a dedicated hardware solution (KIRK chip) to process this encryption and no one but Sony knows how it works and which keys are needed in the process.
By using a real PSP, homebrew applications can communicate with this chip and tell it to decrypt that file without having to know how it does it. That's why we say you need a real PSP for that, atleast until the encryption mechanism is not figured out.