
Microsoft warned that a critical Secure Boot signing certificate is set to expire in about ten days, potentially affecting up to 1.6 billion Windows users and causing update or boot issues on many PCs. The company is changing how Windows Update handles the affected security component and is urging users to check Windows Update, device firmware, and available patches immediately. This problem reinforces the need for better testing and update validation across Windows, tying into recent changes to the Insider program and other reliability-focused fixes.
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