Thanks for the reply DevBiker, very much appreciated - especially today of all days!
There's a file on there called firmware.bin, at the moment though removing and replacing the usb connection has the effect of simply unpluging and re-pluging the usb drive. Also I cant see anything in my device manager that's needing a firmware upgrade.
I've tried every combination of button press i can think of too, by that I mean from a simple press to keeping it pressed while inserting either usb or power connection etc.