Hi ya. I've bought 2 r4 cards and put the games on that we want. If i put the r4 cards in my ds, they both read and show the games but if i put them in my friends ds, all we get is the DS start up screen stating there is no game card inserted. I cannot understand it. Anyone that can help shed light on this matter would be a great help. Thanks!! My friends dstt card works in both ds's!!