On acer switch 11v, i was able to update with update assistant tool, with a few errors on restart. Eventually got it, and restarted a few times after just fine. But i shut down completely, and thats when problems started. It would never boot up. Eventually forced to use recovery drive, but did little to help. Tried startup repair, fix mbr in command prompt nothing worked. Still wouldn't boot from a complete shutdown. Forced to do a fresh install. Then i updated to 1803, which was fine. But when i tried to update to 1809 again, same thing. It would never boot up from a complete shutdown. So did a fresh install again, now on 1803 again til this gets sorted out.
I'm having the EXACT same issue on the same machine. A few of my students are claiming their devices did Windows Updates last night now the machine freezes on startup!
I'm still on 1803 now, my machine won't let me update to 1809 anymore even when I do a "check for updates", which leads me to believe that at least Microsoft is aware of the problem, or at least has detected that my machine has done a bad update in the past. But the fact that it allows your students to update is worrisome, in that it doesn't flag specific models as troublesome, only users who have had unsuccessful udates?
Curious - what version of windows 10 are you on? My HP Spectre (Win 10 Pro) is doing the same as yours it appears. !809 is not being offered.
I reverted back to 1803, and it has stayed there ever since. Even with daily "check fif updates" it won't update to 1809, which us us i know it's blocked on my acer switch 11v.
I also had same problem with Acer Aspire Switch 11V. I updated Windows 10 Home from 1803 to 1809. First try was to freeze at a reboot. I long pushed the power button to shutdown. I turned on the power button again after the shutdown. The Windows 10 Home did not start up. I did it twice. Then, Windows 10 Home reverted from 1809 to 1803. I tried one more time to upgrade 1809. This time, I made a success to upgrade Windows 10 Home as 1809. Then, Windows 10 Home Freezes suddenly. I gave up 1809 and I restored Windows 10 Home as 1803 from the backup.