Sorry, I don't follow.
According to 'https://support.mozilla.org/en-US/kb/microcode-update':
Quote:
Microcode updates do not persist across a reboot, so in the case of a dual-boot system, if the microcode update isn't delivered via BIOS, both operating systems have to provide the update.
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So reverting to an older build(before the "fix") should fix the issue.