Intel seems to change its mind, the latest Microcode Revision Guidance for April 2018 removed 9 architectures from the support list. In Intel’s announcement, the company mentions some security enhancements.
Microsoft, HP, Asus, ASRock & Co. rolling microcode updates out right now, ensure you checked if there is an BIOS update for you or not. Now, a bit late already Windows Build 1607 (Anniversary Update) and 1703 (Creators Update) getting Microcode Updates for all Skylake, Kaby Lake and Coffee Lake systems – the download of KB4091663 & KB4091664 is manual which means you won’t get the Update for your system over Windows Update.
Intel updated yesterday his microcode list to address an issue to resolve the known reboot problem.
Intel has released microcode update v20180108 with Meltdown & Spectre fixes for some CPU families. Of the 94 microcodes in the previous release (v20171117), 19 have been modified in this release; I verified this with a file comparison-by-contents program.
First of all this is for expert users and you should not do it, it’s more a theoretically guidance in case you want to test another microcode.
I do not recommed this method, it’s only to show how you theoretically update the microcode the mopst easiest way.