Pairing with Apple Mac to update using Garmin Express

I’ve been trying to update the firmware on the R10 using Garmin Express on Mac. I’ve been connecting using a USB after disconnecting the device completely from my golf app on iPhone. I’ve tried connecting with the light flashing blue and solid blue but no joy at all. Garmin express searches but never finds the device 

Any tips? And if I can’t connect will then firmware updates be installed via the iPhone app and Bluetooth instead of the wired usb to mac? My distances are so far out that I need to be able to get any updates that may fix this