Hi all! I just wanted to report that I have one of the older M3i Zero cards (not the M3i Zero GMP-Z003) and I updated my 3DS to version 2.1.0-4U. I've had the card for years now, got it for my DSi. Anyway, I tested it out on my 3DS today and much to my amazement, it works. I've read nothing but posts from people saying it won't work with the latest firmware but I can confirm that mine does. I tested three games out on it: Scrabble Ghost Trick: Phantom Detective Dragon Quest the Hand of the Heavenly Bride Scrabble and Ghost Trick worked no problem but I couldn't get Dragon Quest to load past the opening credits but I had the same problem with that game on my DSi. Before using the M3i Zero, I downloaded the latest update for the card (http://www.handheldsources.net/M3DS/Download_M3DSR.html) and used the little usb cable thingy to update the flashcard. Anyway, I just wanted to let people know in case anyone was like me and had just bought a 3DS and was about to go get another flashcard for it thinking their M3i card wouldn't work. It does!