I have bought a second hand 2013 mx5 with the NVA-SD8110EU tomtom sat nav unit. I would like to purchase the LIVE services but when I click on LIVE on the display, it doesn't connect. I looked on the website and in order to find out if the device is compatible with the LIVE Europe service I need the serial number. Does anyone know how to find the serial number on this device? I can't find any sticker or number on the unit or in the car. Thank you.