got a used DSi a few days ago, DSTwo just came in the mail. it boots fine. have not tried a game yet. my DSi is 1.2U, i got my DSTwo from a reputable american vendor and the tray inside the box says in sharpie pen "tested 10/3" ( the day i ordered it) do you think its safe to update? i do want to update, maybe even try zelda four swords. is that safe too?