I've searched for such people locally here in Lithuania. We have a lot of second-hand American cars here and the EU conversion is on high demand, but nobody was able to help me with 500X even for money, unfortunately.
There are some guys online...
I have a 2014 Dart that used to have nav, however since I've tried reverting to an older version of firmware, it won't load. In the dealer mode -> navigation, all of the displayed versions, etc are dashes. The nav page just stays stuck on Please...
If I have modded the file correctly, the ROW and model specific requirements should have been removed so it should work on any 6.5 uConnect - if they share the same private keys!
can you share what changes did you make and where?