Intel recently announced that they have completed their validations and started to release microcode for recent CPU platforms related to Spectre Variant 2 (CVE 2017-5715 [“Branch Target Injection”]). The Windows Update KB4100347 includes microcode updates from Intel.
Right after installing the update KB4100347 via Windows Update channel or the Microsoft Update Catalog, many users faced a problem where the system became unbootable, especially Xeon workstations. Although not necessary, some users wiped their drive, formatted it and installed Windows 10 from scratch to come out of this problem.
But there is no need to clean install Windows 10. This post explains how to make your Windows 10 computer bootable again by undoing/uninstalling KB4100347 offline via Windows Recovery Environment.Read more

