I did a 4" to 8" sync 3 upgrade and I have everything working for the most part the only thing that doesnt work is my steering wheel controls dont work except my volume button. Also my microphone for like phone calls doesnt work so if im using carplay and get a call the headunit just cuts to the normal am or fm radio and i cant speak through the microphone or hear them through my trucks speakers.
SYNC Region: NA
Navigation Variant: Non Nav
Manufacturer Year: Pre MY20
Install Type: Retrofit
Old SYNC Version: 3.4
New SYNC Version: 3.4
Do you have a error message, if so what is it?
none
Remember this is a CGEA 1.2 vehicle and the APIM donor is CGEA 1.3, so you will need to make the adjustments for CGEA 1.2 for the APIM to work properly in your vehicle.