Version 4-1/20 is a really early version of the OS and your dealer is talking rubbish.
Version 4-1/00 (v31 - 10.0) is the latest and you can download and burn a copy yourself.
Download here;
http://www.xoutpost.com/navigation-sy...available.html
Grab a copy of imgburn (
http://www.imgburn.com/index.php?act=download ), get a good blank CD and burn and x1 speed. (this is what I do, others do it at the min write speed of the disc, it's up to you).
Then follow this procedure to update your nav.
When its finished writing your new firmware cd,
Goto the car open the drivers door,
Goto the nav computer and press eject on drive,
Eject the map disc,
Switch ign to pos 1, leave door open.
Insert firmware disc into drive, follow instruction on nav screen.
Wait (approx 6 mins) till sat nav asks to eject cd and reboot.
Eject cd,
Confirm reboot.
Thats it.
Do not swich off ignition or close the door when doing the upgrade.
Also, once updated you can have 3D perspective mode, to enable this, Perspective mode needs to be enabled in 2 places,
1: The hidden setup menu.
2: In the arrow map pointing menu and
Go to the menu screen select set (or settings) and hold menu button for 10 seconds, when the hidden menu appears scroll down untill the perspective mode option is selectable.
Hope this helps.