Under the category of, "Should have left it well enough alone",...
After finding this thread in the weekly "Most Popular Topics" email, I decided to see what SYNC3 version my 2016 had. Version 1.0. So I went to owners site and saw my VIN has a Version 2.2 download available. I followed the instructions, downloaded the ZIP file to my hard drive, extracted the ZIP folder's files to my newly exFAT formatted USB thumb drive, then headed out to my Expy. Fired up the engine, plugged in my USB drive, and saw "Software Updating" come up on the display. Since the instructions on the web site said this update/files-transfer might take "up to an hour" (YIKES!!), I let the engine idle in the driveway, came back in the house, and then started checking on it from time to time. No change in the display after an hour, still not even after TWO hours. Shut down the engine, etc., etc., removed the USB drive, did an engine start-up as instructed, another engine shutdown, then brought the USB thumb drive back to my PC. There was no *.XML file written to the USB drive as the web site's instructions said there would be after a successful update. After letting the Expy sit for maybe twenty minutes (following instructions to let it sit engine-off for "at least five minutes"), I went back out to check. Display still showing "Software Updating" upon engine start-up. I went through the SYNC3's submenus to see what version it thought it had, and sure enough it shows version 2.2. But it still shows it in mid update. Harumph. :/