Hi my comand unit is out dated meaning they don't have any upgrades for it or simply can't be upgraded as per what the dealer told me at MB. My phone nor my navigation works which is odd because the unit has the buttons for it but don't seem to work or have any setup for it. I was wondering if it's possible to swap out a comand unit from a 2006 ML350 for a 2008 or 2007 model?