psp memory stick problem please help

I have two memory sticks, 1gb and 4gb, and they both dont act right. My psp is custom filmware 3.51m33, My 4gb memorystick does not read cso files when i put them in the iso folder, i currently have the disgaea and metal gear solid cso files in the folder but when I go to the game folder in my psp there's nothing there. However my 1gb does not have this problem, it shows the cso files i have and i have access to the games but the problem i have with this memory stick is when I try to save the game file on any psp game, it does not load the save game screen it just gets stuck on checking for memory card. If any one can help please it would really be apreciated!

Your PSP is trying to tell you to buy the games!

No ISO/CSO talk on the DCEmu forums.

Sorry pal. Try elsewhere.

or maybe is telling you
don't buy cheap memory sticks, at least buy the real sony ones even if they are a bit more expensive
LOL

No talk of ISO's

dude go into the psp folder and put them in the GAME folder that what i did

i say get firmware 3.52m33-4 it is said to be the best it the most stable i think