Is anyone able to connect Shimano Di2 SM-BCR2 to Windows inside VirtualBox on Mac OSX?
A late answer, but perhaps it helps some people. I used Vmware and not VirtualBox. However: I had to disconnect and connect the usb port in VMWare, even though Windows noticed that usb was connected to Windows. Shimano DI2 disagreed. A software reconnect of usb inside VMWare fixed this.
The solution suggested about D-Fly does not fix this. I have D-Fly installed, but I needed to update and connect to DI2 wired first before wireless was possible.
SM-BCR2 charger
BT-DN110 battery
EW-WU111 d-fly unit