You want to edit the Mastercode of KH2, where you already have codes of the old Mastercode right? I had that problem, too. Delete that whole KH2 thing from AR MAX and then make a new one(sdo that there are no KH2 codes before making a new one)
Weird, because all the codes I used that come from here work on my german version. (Note: the Seph code really puts an Leon in my party) I mean, the stuff like Axel as boss etc. work. So I think that the PAL codes for KH2 work for every PAL-version of KH2.
This Mastercode works....but it says again that the codes are for the wrong game...i tried all drive Forms(press R2) and Dual Wield Roxas...tested anoither one. The max Drive GAuge one makes the drive gauge unlimited and stays 3...what i mean...the drive gauge goes down, and you have an empty drive gauge left when reverting but it still says max and 3...
I used that one. And every time I put one in, it says the code is for the wrong game. The Mastercode you mean is that one right?
Mastercode
MFAZ-77XN-4KGCK
B26G-P32D-RC506