Microsoft has now made a fix available for AMD devices that are stuck in an unbootable state after installing recent Spectre and Meltdown fixes. These two updates, the first released on January 3, 2018—KB4056898 (Security-only update) or the second released on January 8, 2018—KB4056895 (Monthly Rollup) made AMD devices to fall into an unbootable state.
Now the fix is available as the standalone update KB4073576 and can be downloaded from the Microsoft update catalogue. You can download and install the update by following the link below.
More information about KB4073576:
Known issues in this update
Microsoft is not aware of any issues that affect this update currently.
To install this update, you must have Windows 8.1 or Windows Server 2012 R2 installed.
To apply this update, you don’t have to make any changes to the registry.
You may have to restart the computer after you apply this update.
Update replacement information
This update does not replace a previously released update.