Corrupted Data Icons

Hi

New PSP that was on version 2.60. I upgraded it to 2.71 then back to 1.5 and finally up to dark alex' 3.10 OEa. everything went fine, however now I have moved some PSX and PSP ISOs into the ISO folder I have problems. It's not showing the games at all when I go to game on the XMB, instead it's saying 'corrupted data' all the way down. I then removed the ISOs and it still stays the same? how do i get rid of the corrupted data, even formatted the memory stick and it still says it.

any ideas?

thanks in advance

taken the PSX off and formatted the memory stick and theres still loads of corrupted data icons. I went into the recovery mode at the start and 'enabled' hide corrupted files but it makes no difference. Add to that I cant put videos or photos on at all - it doesnt show.

yeah I'll give that a go and let you know.

I have my doubts about the memory cards authenticity - you think that could affect it? But it did let me do install custom firmware using the memory card so it's all a bit strange at the moment, right downgrade time!

working fine on 3.03oec so my psp must either not like 3.10 or there was an error when installing it. thanks for your advice.