I, too, recently received this notice for my 06. I've updated before and it appeared the required firmware updates for the navigation computer to use the new maps were included on the map DVD as part of the map update. When the new map DVD was inserted into the trunk/boot navigation computer the head unit underwent some sort of update that took a few minutes, after which it appeared to reboot, and then new maps worked.
There was at least one firmware update for these NTG1 units that was usually performed by the dealer in the USA and it updated the head unit to work with enhancements to mBrace in 2010, plus added the ETA feature to the head unit itself.
There was at least one firmware update for these NTG1 units that was usually performed by the dealer in the USA and it updated the head unit to work with enhancements to mBrace in 2010, plus added the ETA feature to the head unit itself.