Update on my retrofit of my radio , instead of the 14/03/2020 the appointment with Walter was changed to yesterday. So yesterday i made the single trip of 490 km and when to see Walter for the retrofit , Walter is a nice guy who really knows what he is doing , My professional radio NBT-HU is replaced with a 2016 unit with DAB+ and full options , he also replaced my original antenna amplifier with one with DAB+. Everything was build in the car like oem and the reception is excellent everything was code on the cars Vin and no errors afterwards reading the car with Rheingold (Ista-D) and E-sys. After 2.5 hours everything was done and i could start my trip of another 490 km back home.
I decided to keep my original unit and antenna..
Thank you Walter great job done.