I used the Cyanlabs Windows method to successfully update to 3.4 from 3.0. it worked well for about a week then it started to go haywire. The first thing I experienced was the Sound Settings would have the EQ all maxed and unable to change settings, the Balance/Fade was stuck in Front Left. I did a master reset using the head unit: No change. I pulled Fuse 33 in the passenger footwell fuse block and it cleared the Fader issue but not the settings issue. I went to the official Ford site and gave my VIN then started the update process only to have a new error message stating " The sync software is not compatible with the installed sync hardware of the vehicle". No hardware was changed and this was using the direct from Ford Updater.
SYNC Region: NA
Navigation Variant: Nav
Manufacturer Year: Pre MY20
Install Type: OEM
Old SYNC Version: 3.4.23188
New SYNC Version: 3.4.23188
Do you have a error message, if so what is it?
The sync software is not compatible with the installed sync hardware of the vehicle
Update Method: CyanLabs Syn3 Updater
Syn3 Updater Version: 2.0
Syn3 Updater Documentation Read: yes
Syn3 Updater Log File
No log files available on thumb drive; user error likely since I tried the Ford Updater method after the initially successful CyanLabs Windows (latest version)