Just curious if anyone else has had this issue and was able to fix it. I recently converted my 8.4A to the 8.4 4C in my 2017 2500. I got it from infotainment. Infotainment has been no help. Everything works but for some reason at start up a message pops up and says "device not supported" with nothing plugged into the USB hub. If I plug in, let's say an iPod to the USB hub, it says "connect device" but music still plays no music info shows. Then when I go to select the USB under the source tab it says "device not supported". It appears that the new USB isn't fully communicating with the radio. Any fixes?