I have a PSP 2000 model that I had installed with custom firmware for Update 6.6.1 on two 1-gig Memory Sticks.

Recently, I downloaded a few ISOs to the sticks and played them. Awhile later, after my PSP gradually ran out of charge while being in sleep mode, it shut down. I recharged the battery and powered it on.

(Take note, after my PSP's battery runs out of charge and turned on again the date and time has to be manually set upon bootup. This has to be done EVERY time. Is this normal?)

When I went to play my ISO's again, I discovered that, on the Memory Stick, they're icons to select them were gone! Crazily enough, however, the save files on the Save Data section of the Stick, AND the leftover spaceon the Stick, AND even the ISOs themselves seen from my computer on the "ISO" folder(!) had indicated that the ISOs were not gone, but simply unplayable.

The problem is that I can't play them, even though the information on the Sticks indicate that the ISOs are there! What am I supposed to do?

Thanks!