New DSTT card (R4) won't work

I just bought a new R4 card (called a TTDS). I took all of my son's games, whatever was on his 2G card, and copied it to the new card. When I put it in the NDS it shows a menu sign in red with a question mark. What am I doing wrong and how do I get this thing to work.

It's not a R4 card. It's a completely different flashcart. You need to use the right firmware(system files) for the DSTT. Download this firmware http://www.linfoxdomain.com/nintendo/ds/dl.php/DSTT_Menu_v1.17_English.zip If you installed the files on your son's R4?, just repeat the same instructions, extract, go into the folder, take all the files and folders and have them straight onto the root (first directory/folder) of your MicroSD.