I tried the following methods. None of them make the save work. - SDF export User save & Extdata save, then restore both to a second 3DS - Just copy the most update SD files to a previously CTRNAND transferred 3DS (I used to System Transfer) and play it (It works for every other game including Pokemon SM / other Card2 games) All of the above reports Save Corrupted. Only the following method makes the save work: - CTRNAND transfer to a second 3DS I used to System Transfer I doubt if this game's save is tied to NAND due to everything I described above. Anyone has any idea?