My nephew recently got a new DS Lite, and it worked fine for about two weeks with my spare R4. Well then one day it appeared that a bunch of the firmware files vanished, and an error showed up that said no DS_Menu.dat or similar. So I checked and Fossil Fighters and nearly all the firmware files were gone. So I fixed them, and put YSmenu on it. Well now the card won't load and when I put it in a PC it says it needs reformatted. Is there anything I can do to fix this? Is there anything like a child proof firmware/option for the R4 in case he is just deleting them somehow?