Windows 11 Startup Issues Officially Blamed on Cumulative Update Problems
Windows 11 Boot Issues linked to December Update and Subsequent Patch Users of Windows 11 are facing boot failures, frequently enough resulting in a black screen and an UNMOUNTABLE_BOOT_VOLUME (0xED) error, stemming from issues with the December 2025 update and exacerbated by the January 2026 patch, KB5074109. The problem appears to be a cascading effect … Read more