games not working

i downloaded a few games ( like tamagotchi connection cornershop 3 ) and they are not working . i really donno why . a msg appear when it load until around 3/4 . the msg says that ; rom loading failed . load rom errcode=-7 . Please reset system . please help me thanks . ( im using DSTT w a SanDisk 2GB memory card w around 785MB used up )

Update your firmware at http://www.linfoxdomain.com/ds/.

but i donno how to update ? and i dont even know wads a firmware ..

Thank you . I followed the tutorial and its working now ;D

I'm very new to the this world and just wanted to say thanks, you've helped me out at well. I'm happy, my kids are happy. Thanks again. So glad I've found this site.