Microsoft has temporarily halted sending out Windows security updates to devices containing AMD processors, after customer complaints. Microsoft has determined that some AMD chipsets do not conform to the documentation previously provided to Microsoft to develop the Windows operating system mitigations to protect against the Spectre and Meltdown vulnerabilities. Users with affected hardware found that after the security patch was installed they found themselves facing the Windows boot-up screen, and then nothing more. Unless your anti-virus certifies it is compatible, you arent going to get any more security updates from Microsoft”]
Source: https://grahamcluley.com/ouch-microsofts-spectre-security-update-bricks-amd-powered-pcs/