ChickHEN

I have a FAT, PINK, JAPANESE psp.

I modded it to CFW 5.00 M33-6 with, using chickhen R2.

But wont load games like YUGIOH tagforce 3 or DISGAEA afternoon of darkness. I tired both ISO and CSO. It just starst and after the with PSP screen, it goes black.

do i need to upgrade?
or is it just my psp?
is it the memory stick?
what can i do?

thanks!