Take some version of iGO8, like 8.3.5, and put inside iGO8 8.3.5, instead Primo, then connect your tmc receiever or car charger, if tmc is integrated in car charger, go in settings, and TMC settings, and put automatically scaning for TMC port and baud rate,to see will iGO8 8.3.5 will detect it, if detect it, go in save folder, find system.ini, and there you'll have real values of tmc port and baud rate for your device, then put that values in Primo sys.txt, and then try to see will it detect FM stations and TMC signal, most of TMC receievers requires to have connected charger if tmc receiever is separately device.

To have working TMC you'll need tmc files for Primo and appropriate license, for Primo not free license in public for TMC, for iGO8 8.3.5 will work without that special TMC license.