It has come to our attention that Norton Internet Security and Norton 360 software can interfere with the smooth running of the update process, and there have also been occasions where other anti-virus or firewall software have caused issues.
If you experience difficulty getting the Naviextras Toolbox software to recognise that your device is connected, it might be worth disabling the software for the duration of the update, and then re-enable it after the update process is complete.
Most software of this nature has the facility to let you suspend it for a set time period (eg. 10 minutes), and then automatically re-enable it once that time period has expired.