I just got a new SKY3DS (with the blue button). I tried a generic 16GB MicroSD, but Diskwriter formats and writes to the card and seems to work. When I power up the 3DS with the SKY3DS inserted (with our without the MicroSD inserted) I get a blank icon. I've tried pulling it and reinserting it numerous times. I also bought an ACE3DS PLUS and got that to work. I am using a game that is on the SKY3DS supported list. I also tried it with a Samsung 16GB. Same thing. The instructions/guides I've found don't really say/show what should happen when the card is recognized.