So, I'm gonna have to hack another 3DS of mine and I went to install NTRBoot on it using my already cfw'd N3DS. I think this was the first time I've removed the flashcard after updating, but now it doesn't show up at all on home menu. I even tried 3 different cards, putting it back in again and again, formatting and downloading a fresh copy of the kernel. Yes, the microSD's formatted as fat32. (If it's got something to do with it I first tried to install NTRBoot on it, then it kept saying "Your flashcart is not supported")