You have psp with 3.71 M33 everytime you try to play a CSO game it says 'The game could not be started 80020321' why is this?
press select after you turn on the psp then ull see M33 VSH MENu
go to UMD ISO MODE then change it by pressing left and right button
make it Sony NP9660 then press exit.,.that's it u don't need to
download anything in the internet.,hopefully that helps..