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ISO and CSO (compressed ISO) can only be played on CFW (custom firmware) or (i think) version 1.50 official firmware. You CANNOT downgrade to an earlier custom firmware or software sit until a newer custom firmware is available. You will have to make a Pandora Battery and a Magic Memory Stick. Basically you have to open up a PSP battery and cut a certain peg. The magic memory stick is alot easier and doesn't pose a threat to the PSP. Watch a tutorial on YouTube for the Pandora Battery so you don't stuff up, there is a different method for the PSP Slim battery and the PSP Phat one.

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16y ago

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