Thanks Dan, think I would prefer to go the USB routeIt’s by USB.
Or, since you’re now good at taking the dash apart, if you like, you can take the hard disk out of the nav unit and install Volvo map data directly
There’s another thread on here on how to do that, but not for the feint hearted lol.
So presumably it's a case of booting from a USB memory stick upon turning on the car or is there some routine that needs to be followed?
Tell you what I reckon I could get that dash apart blind folded