Okay so I used the simply rev program and put the generated _DS_MENU.DAT and TTmenu file on my ds and it worked fine for a few minutes and then it crashed and when I booted up it said can't find _DS_MENU.DAT and when I put my micro sd into my pc the card comes up blank but its memory is completely maxed out. I forgot to back up before I did this so I was wondering if it is reversible or if I just need to re-format my card?