Psp cso files ???

I have a psp and a 2 gega byte memory card , I own downloaded some cso files but non of them seem 2 work except for the ones near small sizes like 18 mega and 30 mega ! The rest wich r between 100 - 400 mega won't work the psp recognize them but doesn't run them when i run them a black screen apears and zilch else happens.
What do I do??


Answers:    You involve custom firmware and PSP won't run cso files only iso

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