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10.1 supreme here, just injected my my 10.3 friend's Shuffle extdata into my own 3DS and got the new stages. He actually checked in with my save, but when I tried to import it coming from his game I got the "system config change" error but I can access the Special stages just fine on my own pre-checkin save restored onto the latest version, the game acts as if I had just "discovered" the new stages like it would do after a normal checkin update.
Well, obviously I can't participate competitions unless I update (I actually can update if I really bother, I use Ironhax which is compatible with the latest version if I update the payload, but I don't really want to give up on menuhax yet), but at least I can enjoy the new main stages which is nice well for a short time since they're just 10 and no experts, GS pls.