I hope this is the place to post these, but I just got a system with the correct firmware version, and tried plugging in the blue card with the files on it and it just comes up with an error on my 3DS. The only thing I can think of that might be the issue is... does anyone know if there's a size limit on the MicroSD card that can be used? I've got a 16gb MicroSD HC and I wonder if that's the problem, but I don't have a smaller card to test it.