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    KB5105943 Secure Boot Cert Block: Windows PCs Keep Booting, Security Can Erode

    Microsoft on June 29, 2026 published KB5105943 to explain why some Windows 10, Windows 11, and Windows Server devices are being blocked from receiving updated Secure Boot certificates, and what happens if those machines reach certificate expiration without the new trust material installed. The...
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    • kb5105943 secure boot windows 11 windows server
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