Critical Windows Update Glitch: USB & Performance Issues Detected

At Xphiz Digital Technologies, we stay ahead of critical system updates to ensure uninterrupted operations for our clients.
Microsoft’s latest cumulative update - KB5066835 (OS Build 26100.6899) - released on October 14, 2025, is causing major disruptions across Windows 11 (24H2/25H2) and Windows Server 2025 environments.

🔹 Primary Issue:
USB keyboards and mice become completely unresponsive in the Windows Recovery Environment (WinRE) - preventing access to vital recovery and repair tools.
🔹Other Reported Problems:
• Failed localhost network connections
• Update installation errors
• Blank File Explorer preview panes
• Sluggish system performance and app delays
Microsoft has acknowledged the issue (October 17) and is developing a fix.

✅ Recommended Actions:
• Avoid using WinRE until the patch is fixed
• Use Windows installation media for recovery tasks
• Uninstall KB5066835 only if absolutely necessary (note: this reopens security risks)
• Pause automatic updates in critical systems

At Xphiz Digital Technologies, our IT team continues to test updates in controlled environments before full deployment - safeguarding system integrity and minimizing operational risks.

Key Insight: Even essential security patches can trigger unexpected issues. Proactive monitoring, staged deployment, and reliable backup processes remain the best defense against downtime.
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