Newb question

I recently updated from MyFord Touch in my '14 Fiesta ST to a Sync 3 unit from a 2016-2019 Fiesta ST. When I first installed it I just plugged it in and everything worked fine. The only thing that didn’t work was the navigation which was stuck at a random intersection across the country. But I assumed this was because I didn’t have a GPS antenna plugged in. After a few months I finally plugged in a GPS antenna last week, and at the same time I updated to Sync 3.4 and activated my back up camera as well. Everything has been working fine but my navigation screen is now blank and when I check the DTCs I keep seeing a code for an open circuit for the GPS antenna. I’ve tried three different antennas, got a fourth coming on Sunday but at this point I doubt it could be an antenna issue. Any other ideas? I’m also very confused about what AsBuilt I should have, since my car is a 2014 but my head unit is from a 16-19.

SYNC Region: NA

Navigation Variant: Nav

Manufacturer Year: Pre MY20

Install Type: Retrofit

Old SYNC Version: 2.2.16280

New SYNC Version: 3.4.23188

Do you have a error message, if so what is it?
Sometimes just a blank screen, sometimes it will say “error with navigation system” or something similar.

Update Method: CyanLabs Syn3 Updater

Syn3 Updater Version:

Syn3 Updater Documentation Read: yes

Syn3 Updater Log File