Toxic have released a patcher for dual layer games that removes the media checks, basically doing the same job as their firmware for the DMS4, but this time applying it to an ISO of the game so that the burned copy already has the checks removed.
Very useful for 1:1 dual layer backups of games like Gran Turismo 4, Kessen III, God of War and the like for people who don't have DMS4s or Matrix Infinitys.
Personally I have tested this and got a 1:1 copy of Gran Turismo 4 on DVD+R DL working on a v7 PS2 with DMS3. Unfortunately the same copy won't work on my v7 PS2 with Magic 3.1.
Thank you Toxic, and good luck to anyone who tries this!
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Honda CB500 twin history