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I've put a custom firmware(6.60 PRO-C) onto my PSP. I know that to play custom games on it you have to make a folder called ISO on the memory stick. My problem is that my PSP thinks the folder is corrupt data, even before I put an ISO in it. Any help would be appreciated.
Format the memstick with the PSP the ISO folder and all other folders should be auto created for you
To transfur your software hook the PSP to your computer via the usb cable and set the PSP to USB mode (It's a safer way to do it)
Backup before doing the above though obviously as formatting will delete everything on the memstick