SUMMON NIGHT TWIN AGE

Please help! I really wanted to play this game badly. I have downloaded the game into my SD card (EDGE flashcart). I have about 120++ MB space left in my SD so there's plenty of space for a saved game (i think) . I have finished Chapter 0, but I cannot save my game. It simply says "Game cannot be saved, please reinsert game card" or something. It seems kinda pointless playing this if i can't save my game.What should I do? All the other games seem to work fine (except for Etrian Odyssey II, which is another topic, I guess).I really, really wanna play this badly. so please help

do you have the latest firmware installed on your flashcart?

Save files normally take about 512 or even less on all flashcarts, so 120MB is plenty enough. If you have the latest version of firmware, try using the Arm 7 injector at http://www.linfoxdomain.com/nintendo/ds/.