need help...

ok i was deleteing some stuff from my psp and by mistake i deleted my iso. so then i try to put the iso back into it and for some reason my computer wont let me. it keeps on saying error 0x80070057: The parameter is incorrect. What does that mean and how do i fix it. The iso was FTB2 and then i tryed a GTA liberty city stories and it worked but then i tryed to put the FTB2 again like 20 times and then i tryed the 762. FTB3 CSO and it didnt work thier. Please help me

Ohh You used the program the makes your memory stick 4G that's why you can't put the games,,I suggest you to save all your file and format the memory stick.and then put the files back and dont used the program to make it 4G.the only way you used the 4G memory stick if it's only for music etc..Except from games because you will get the same error.
Error 0x80070057: The parameter is incorrect

ooooo thanks problems and it worked rep+ for u and also i figure out a trick im gonna download all the iso's i want then when i max out ill just turn it in a 4gb and the isos will still work and also sum iso's can still be downloaded to the psp even when u turn the memory stick into a 4gb

Ohhh thats nice lol

damnnn i was using a sandisk memory stick and now i cnt play ftb2 online. it fuked up my memory lol. i guess i need a new memory stick to play online and wondebread is fuk and my coder pr wont work ethier

LOL keep is a 1GB