I copied over the contents of my current MicroSD card to my new 64GB one I just bought, it has ReiNAND on it. And now when I put the new MicroSD card in, it doesn't read it on the New 3DS. It just loads it to the main 3DS menu giving a message saying it couldn't detect a MicroSD card.
The MicroSD is a Kingston MicroSD XC1 (Class 10).
The MicroSD is a Kingston MicroSD XC1 (Class 10).