Okay, so this may be of some importance, but in the /Nintendo 3DS directory, there is two files corresponding to <ID0> (explained
here)
And it looks like all of my games are still in one of them (2 gigs .app file, corresponding ID's), but the console is now using the other one (i installed a game, which went right into the other <ID0> file).
However, i don't know if i can just copy this for the games to appear again. I could also redownload and reinstall each game and move the save file, but that would be quite bothersome (if not useless).
Did someone already encountered such a situation ?