Ok, so I have a sandisk sd card. Whenever I try to save a nds game, I get a "unable to write to cart, please turn off power and reinsert game". Of course for some odd reason it only happens 50% of the time. I've had the m3 for about 7 months, but it's only started to happen now. I've tried reformatting my card, updating and downgrading, but no luck. Thanks to anyone who can help me..I hate playing games and not being able to save .