I recently updated to v4.0 using assassda's guide found here http://gbatemp.net/index.php?showtopic=144835, which also let me run 1:1 backups off the disc channel. All my games seem to be working fine, but I tried my 1:1 version of Madworld, and I got DVD read error 559, so I wrote another DVD and the same thing. All my other games seem to be working which is the strange thing. :s I'm also using the 002 fix gamma edition which apparently fixed Madworld, but that didn't work either. Please help, thanks. edit: the game is also usa version if that counts, though i enabled skip update in preloader 0.29.