I have seen different build numbers for Sync 3.4, and was wondering if there are different ones for different trucks (maybe different build versions for NAV and non NAV systems?). When I check for updates using my VIN numbers, my previous 2019 and current 2020 both said the latest update for Sync was v3.4.20136 .
I have seen others mention 20205 and other build versions on their systems. Just curious as to why my update would be 20136 when others are higher numbers.....? Both trucks have NAV .

 

I believe 20136 is the latest official release. The later ones are still betas is my understanding.