https://www.pcgamer.com/windows-10-update-includes-a-spectre-fix-that-plays-nice-with-amd-systems/

Microsoft has begun pushing out a Windows 10 update that includes a Spectre fix for AMD systems. Unlike the previous patch, however, this one will not cause older AMD rigs to become unbootable.

That was the unfortunate situation in early January when Microsoft pushed out a patch that caused some older AMD processors to stop booting, such as the Athlon X2 6000+. Microsoft quickly pulled the patch while putting blame on AMD's documentation for the screw up, rather than its own patch code.