Since it’s a MY20 APIM, you can’t go past 3.0 by using Syn3Updater
If other options are possible it depends on Ford. I mean, if it’s a dealership, I’m sure you can contact Ford to see what options do you have.
My 2017 model is also from 2017 and according to Ford I’m running the latest Sync3 3.0 version. My car was never meant to have 3.4, so it makes sense.
Again, to go from 3.0 to 3.4 with Syn3updater you need to reformat the APIM, which you can’t since it’s MY20.
No thread, but usually MY20 are flagged by part number.
L series and up, are MY20. And some J ones that are replacement units.
Safest way is to check the sticker.
Tons of mentions of this in the threads. It comes down to the newer FCIM-B drivers not being available and there is no access to a newer reformatting tool being leaked to make it happen.