I have a 3ds v4.2.0-9U. Just got my gateway 3ds for few days. I tried many times to play 3ds roms using the gateway 3ds flashcart, but with no avail. Here is the problem. I followed the correct instructions. First insert the blue card and do the verifying and programming thing. However, every time after I clicked system settings-other settings-profile-nintendo DS profile, the gateway menu did show. BUT after I inserted the red card and select to BOOT GATEWAY MODE, it just went completely black screen and would never went back to the home menu to let me play games. What should I do ? The gateway 3ds flashcart claims to support v4.1-9.2 But why this happens ?