hi I have a 2012 w204 which I purchased in feb this year with the Becker map pilot in the glove box I decided today to try and update the map as it is very out of date so I removed the unit from the glove box and connected it to my MacBook with a generic usb lead I had in the house as I don't have the red lead I cannot get the map content manager to load all I get is a security message from apple saying its not a trusted app so I tried on my daughters pc but still no joy I see there is an SD card slot on the side of the unit can I buy updated maps on card and just insert the card if so where do I get them from ? the unit works fine in the car just out of date I have seen the units on sale on eBay are they just plug and play maybe I should just buy one of these any help would be appreciated.