dear sir,

i will sincerely appreciate your help,i am having a ntsc-j,3.2,cios rev 14,
what cios do i have to upgrade downgrade?.i am unable to play guitar hero world tour,5,rock band 2 ,i get no dvd (n) when i insert these backups,im sure its not because of the dvd quality(im having over 50 games),,,since i can play all other games even new ones like fifa 10,nhl 10,muramasa etc...,i would like to know what to do to make these work...rock band the beatles is working and so is GH3...
help wanted..ive tried so many forums etc from the last 3 months...i would be very grateful

regards
roshan kalro
+91-9710314483