hi i have had my psp encoded to the latest 3.1 and was told i didnt need to use devhook for any games i wanted to play. i have had a film called russia with love that came in as a cso file. do i have to format the mem stick before i copy the game into the stick? also i have made an iso file on the stick and copied game into it but the psp doesnt recognise any game on it. what am i doing wrong? any ideas anyone? thanks.