I have Sync3 in my 2022 EcoSport - I purchased the 8” screen unit and installed it. When I turn it on I get a full size “FORD” then it goes back to the 4” display in the upper left corner of the screen. All the posts I found have instructions for everyone but the average person that is doing this for the first time. Nothing black and white how to get my Sync3 to recognize the new screen. 
I need laymans terms and step by step directions. I downloaded FORScan to my lab top but don’t know what to do with it and I am just lost. Now the unit just sits on AM radio with the old small display in the corner. Please help.
Didn’t you think it was important to mention which Sync3 version the unit is running?.