So I have the DSTT and ALL games used to work (even contra 4).
I got this "game" called "Kanji Sonomama Rakubiki Jiten", it doesn't work and it froze all my DS games. I formatted my 4gb SanDisk microSDHC to FAT16 and the games started working, but not Kanji Sonomama... And I turned off my DS and...