I recently got an R4 which appears to be legit, although it won't let me write data to my MicroSD card. (eg. I can't save drawings in 'Colours' or .sav files for any games/apps) I'm using firmware v1.18, and have tried with a 2GB (FAT16 & 32) and 512MB Kingston MicroSD cards. I can write to them fine when they're in the computer, but not in the DS/R4. This means a lot of homebrew (including Moonshell ) that write to the card on launch don't work. Please help on how I can fix this problem!