I got it to work ONCE on my first DS lite, whenn it ran Phoenix Wright. But every following reboot brought me to the main DS screen. Then finally it loaded two bright screens and allowed me to reboot. And then it Loaded the M3 Real logo and 2 black screens. Then the DS refused to charge or turn on. (Thank god for warranties) I tried it with my second DS lite and it caused it to stop turning on or charging after a single try. (Replaced again by best buy) Now I have my third, I'm very hesitant to even try the Cart, but I want to know what may be causing this. I'm not a very wealthy person so i can't afford DS games legitimately.. So I really need a cart for this DS to actually be useful. Any Ideas on a fix and or what might be up? I just downloaded a new SYSTEM folder and reformatted my 4 gig Micro SDhc card to FAT (was FAT32). But I REALLY don't think my warranty will hold up this time if it were to break. So I haven't even put the M3 Real in my new DSL yet.
if i were you, i would NOT try your M3 again. i would get another flash card, maybe a Edge or Supercard DSOne or EzFlash Vplus/GBA combo pack.