It would be good if we could get a list going of which Bluetooth module we have fitted and which hardware revision we're on, just to give prospective upgraders/DM purchasers an idea. My intention is to fit the newer unit in the van soon, check the Bluetooth version, load 0478 and see what happens and report back.
My unit is HW version H22, I have not yet checked my newer unit to see what version that has, but it will be a H3x HW version. If it's UGZZF-1 01A / D408, it's no good unfortunately, you'll lose WiFi when upgrading to 0478. If it's UGZZF-1 A1A / C194, I believe it *should* update OK to C300. If it's UGZZF-1 A1A / C300, you're good to go. The good news is, you can check either via MIBStd2 toolbox or the settings menu as to which version Bluetooth module you have. So the issue is not the wrong firmware being installed, it's the rest of the firmware only expecting to find something running C300 firmware.
My intention was to force the D408 Bluetooth firmware on to the unit, but having checked with MIBStd2 toolbox (MIB_info option) it already identified as a UGZZF-1 01A with FW D408, even though the menu system (Version info or similar) says it's a C300. So, a bit of time spent on the WiFi issue this afternoon.