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you wont be able to play .iso files(games in the iso folder) because you updated to Sony's official firmware.
but in order to play .iso files again you will have to hack you psp and make sure its running cfw(custom firmware).
I think the best solution is to downgrade your PSP system software to the original version and check if your games load. What might have happened is that the firmware software that was on the PSP was downgraded to play copied games, and now you've changed the firmware to a newer version and that is why your games won't load. You might hac=ve to get your PSP downgraded again to play the games from your memory card.