You've likely obviously resolved the issue by this point and I apologize for getting in touch this late, I'm catching up and helping out as an admin for Yamaha DTX.com. David has been a big help though!
It could be a couple of things, but I'll just say to check the USB-AB cable going from the module into the camera connection kit. And yes, make sure firmware is up to date, and the camera connection kit is operational. "I accidentally stepped on mine one time, and it loosened up the connecting end where the USB goes into, cutting off the signal .
Thanks Rob, happy drumming.