You should know that the Game Shark for the DS is only a "Game Save" manager. That means that it's not a cheat device! The Game Shark for the GBASP is a Cheat Device. It will work provided that your using a GBA Game.
You need to make sure that your only using Official Codes. You need to make sure that all the codes entered is 100% correct. That includes the code used for the game title (it is also known as Master Code or "[M] Must be on"). You also need to make sure that if your using a US Game then you use the US Cheats, if your using European games then you should using Euro codes (labeled EUR).
Please make sure that your Game Shark product is made by MadCatz Inc. because we only offer support for that product. If you want to know if it is or not then please read the following thread:
http://forums.gameshark.com/index.php?show...ndpost&p=435128If your product does not look like one of those then I suggest you try doing a google search for it because we only offer support for those product!