[DJ Frisat]

Microsoft says it was necessary to delay the update on these systems to avoid Blue Screen of Death errors that would leave the device unable to boot.

Ah, 'fail-safe' -- can't boot, won't be exploited whilst online. At least, you'll have a secure doorstop...

[hsmomx3]

There was an update that installed today, Windows 10 1709 which required a restart.