Manually install HN1T-14G381-SA, which is 2.2.17011, known as the “AA/CP activation build”. Once you confirms AA/CP works, you can do whatever you want to the unit.
Also, you will have to replace the USB HUB if you plan to upgrade to 3.4 → Media Hub, CarPlay Compatible - 2015-2020 Ford/Lincoln - SYNC 3