General guides, not all steps applies to all bios systems:
[GUIDE] AMI INTEL CPU Microcode Update Guide - Special Topics / CPU Microcodes - Win-Raid Forum (level1techs.com)
[GUIDE] Update CPU Microcode + Fix FIT Using UEFITool / Hex - Special Topics / CPU Microcodes - Win-Raid Forum (level1techs.com)
MC Extractor: Intel, AMD, VIA & Freescale Microcode Extraction Tool Discussion - Special Topics / CPU Microcodes - Win-Raid Forum (level1techs.com)
Intel, AMD, VIA & Freescale CPU Microcode Repositories Discussion - Special Topics / CPU Microcodes - Win-Raid Forum (level1techs.com)
[OFFER] Intel CPU Microcode Archives - Special Topics / CPU Microcodes - Win-Raid Forum (level1techs.com)