Hi, I'm dreamcast user in Korea. I don't know english well. please understand even if you can't understand me clearly. I updated lasted firmware & special update a few days. but GDI images is not working. I only playing GDI images. and I have ver.4. but korean seller tuned up internal usb type. (ver.5 type) What is difference? How can I fix it? How can I play dreamcast games again? Please help me!!! I want play the games again. Thank you...