How to fix October 10 update causing 'Inaccessible Boot Device' error in Windows 10

[Windows Central]

Here's a workaround Microsoft suggests if your device is failing to boot after installing the October 10 Patch Tuesday update.
On October 10, Microsoft rolled out its Patch Tuesday for Windows 10 as usual, but unfortunately a number of users quickly started reporting an "Inaccessible Boot Device" Blue Screen of Death (BSOD) error message that prevented computers from booting correctly.
The problem occurred as a result that Microsoft mistakenly published the delta and cumulative updates to Windows Server Update Services (WSUS) and System Center Configuration Manager allowing devices to try to install both updates at the same time.
Although Microsoft has already corrected the publishing problem, the company's TechNet website (via Neowin) outlines a new set of instructions to fix the issue on the Windows 10 Creators Update and those devices running the Anniversary Update.

Full story from the WindowsCentral blog...