I purchased a Kufatec Bluetooth interface Basic Plus for RNS-E. Install was straight forward. I coded all the components and started the car. My iPhone 5 pairs with the interface and I am able to make and receive calls with no problems. The problem I do have is that the RNS-E refuses to be coded and shows "no telephone installed." The code I have is 0309137 and I want to change it to 0309637, 6 is the US phone version. When I code it with VCDS it says that it goes through, yet the code does not change and I get this error code: The RNS-E in the car is factory installed. I have upgraded the maps to 2010-2011. The firmware I have now shows "X---" Any ideas what I can do? Thanks!