My games stoped working, help?

I don't know why but all my games keep saying "cannot read data, turn off and reinsert game card" :o Does anyone know how to fix this? ??? ??? ??? I am in a BIG jam :( :'(

reinstall your flashcart firmware

https://www.romulation.org/forum/index.php/topic,1462.0.html

firmwire? What's that?

The files needed to make your flashcart work. They release new firmware updates to fix things etc. Go here to download the firmware for your cart. http://www.linfoxdomain.com/nintendo/ds.

Old firmware versions may not be able to run newer games, so remember to update your flashcart's firmware whenever a new one is released.