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Microsoft is doing “maintenance work” on Secure Boot, before it becomes a problem

Secure Boot has been around since 2011, quietly doing one very important job: stopping unauthorized or tampered code from sneaking into your PC during the boot process. It's also one of the reasons Windows 11 has stricter hardware requirements — Microsoft wants more devices to have this boot-level protection turned on and working properly.

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Windows 11 Security Update (KB5077181) (26200.7840): what it fixes, and what (if anything) changes

If you're seeing "2026-02 Security Update (KB5077181) (26200.7840)" with a restart prompt, that's the February 2026 mandatory cumulative security update for Windows 11 version 25H2 (build 26200.7840). The same update also applies to Windows 11 24H2 (build 26100.7840), but your screenshot is clearly the 25H2 build line.

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What This Windows Update Actually Brings (KB5074105, build 26200.7705)

That "2026-01 Preview Update (KB5074105) (26200.7705)" you're seeing isn't a typical Patch Tuesday security drop. It's a non-security preview update for Windows 11 (listed for version 25H2 and 24H2) that focuses on new features plus a long list of reliability fixes.

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