If you are talking about an actual game cartridge, then this thread will help. http://gbatemp.net/t...sds-gamessaves/
Otherwise, if you are trying to get it from your flashcart you should just be able to read it straight from the microSD card.
I've been playing fallout4 all day, I went into a elevator and it kept going, never stopped, waited 5 minutes, must of been a bug. How bout you, whatcha do today?