nds saving problems

On my nds I use Fire link to play my games but for some reason a lot of games are unable to be saved on it. What do I need to do to fix this problem? If the whole set up just stinks, what do I need to buy to fix it? Do I need a new little memory card, or a new part to put in the gba slot? Any help is appreciated.

hope usefulhttp://www.shunyweb.info/convert.php

not too sure what im supposed to do with that site. I'm not sure what kind of .sav files I have or if they are even on that list, and i'm not sure what to change them too.

Slot 1, right? I don't believe Fire Link is a good card, it might be the card itself. Try upgrading the firmware, or backup then reformat your MicroSD card.

Always best to reformat first and then update. For obvious reasons. Shunyweb allows you to convert saves that have a different save type for different systems (Action Replay etc.) for emulators, and various flashcarts.