I have the firmware m33 and i can get gradiusiso to work by putting it in my iso file but if i put any other iso the same way it won't show up or i'll get a corrupted sign. I tried Rathet and Clank and Valkyrie profile and it won't and all i get is a corrupted icon. Is there only selected kinds of games that work with this firmware or am i doing something wrong? All files are in iso format with the game and umd bin file but i can only get gradiuos to work. Thanx in advance.