So I’ve always had this issue and can’t seem to figure out what the issue may be. I have a DSTwo+ Super card, the 4in1, and it doesn’t register on my New 3DS XL. It plays on my friends 3DS and my system, which runs on Luma, reads regular DS Cards just fine. It’s only on my system that doesn’t read the DSTwo. Any thoughts? I’ve tried updating the Luma Software and uninstalling/reinstalling it. Still no luck. Is there a setting I’m missing?