[humming]

I did actually try both methods of downloading the maps update, straight to USB and to hard disk then USB. In both cases I verified the download on the USB using the Volvo tool.

When I plugged the USB into the car both methods resulted in the same problem, “Map update failed. USB unreadable” message.

It was worth the effort of having to keep pressing the 'exit' button as some roads that were missing on a new estate by me, on the previous maps, are now visible.

I do wonder if some cars have a dodgy USB connector.