i downgraded my psp from a v2.0 to a v1.5 successfully. i loaded up NesterJ to PSP/GAME/NesterJ_v1_01 & the roms folder is in PSP/GAME/ROMS

when i access games/memory stick on the psp menu, it recognizes NesterJ & shows the logo. the roms folder on the other hand shows a square with a lightining bolt running through it & along side of it, it says "corrupted data".

when i access NesterJ, the psp boot logo pops up, then the screen goes black for a few seconds, and a box pops up that says "The game could not be started. (80020001)".

any ideas on how to fix this? thanks!