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Dealers can normally do a firmware upgrade for you. On my previous Fords, I would ask them to do it when I get an oil change. They don't normally charge for the update but ask first anyways.
I'd give up the notion of a Sync 4 update. The question is, can Ford update the existing Sync 3 to make better use of the 10.1 portrait screen. Android auto and Carplay both have dynamic scaling capabilities but Ford is not implementing them. It would be nice if you could customize font size and screen layout. Right now the screen layout is a joke--so much wasted space! The font sizes are like you've turned on an accessibility option for people with poor eyesight. The useful portion of the screen takes up only 1/3 of the screen.
If you chat (ask) with Ford, they say this: "No it will not. This vehicle is equipped with SYNC 3 and cannot be upgraded to SYNC 4, however we will continue to update the software for this system you have in this vehicle."