Hey! yah! This happened to me too! Friggin bugger....except, i did a complete reset and format....i did save my games on an SD card, but when I tried to transfer them, it wouldn't let me...
Do i just call nintendo CS?
Which I think is totally legit...they did advertise that the DS-X is not solely for the purpose of playing ROMs or something like that
besides, once you get the arm7 fixed, it's all hunky dorey!