In a surprising turn of events, Microsoft’s October security update has inadvertently rendered USB mice and keyboards inoperable within the Windows Recovery Environment (WinRE). This mode serves as a vital repair tool, automatically activated when Windows identifies significant issues, such as corrupted files or problematic updates. However, the recent update has complicated matters for users facing system failures.
The security update, identified as KB5066835 and released on October 14, 2025, has been officially acknowledged by Microsoft. The company stated:
“After installing the Windows security update released on October 14, 2025 (KB5066835), USB devices, such as keyboards and mice, do not function in the Windows Recovery Environment (WinRE).”
This issue does not affect all users immediately; those whose systems are functioning normally will not encounter difficulties. However, for those who find themselves needing recovery mode, the situation becomes doubly frustrating—facing a malfunctioning system alongside a non-responsive recovery environment.
Even the presence of a Bluetooth mouse will not alleviate the problem, as WinRE operates with a minimal driver set designed for stability during troubleshooting. This environment does not support the installation of new hardware drivers, including those necessary for Bluetooth devices. The only potential lifeline for users may be if they possess a machine with PS/2 connectors, a technology that has largely been phased out since the early 2000s in favor of USB connections.
The issue impacts both client versions, specifically Windows 11 24H2 and 25H2, as well as the Windows Server 2025 platform. Users can verify their version by right-clicking the Windows icon and selecting System, then scrolling to “Windows specifications.”
For those who have previously created a USB recovery drive, there remains an alternative route. Booting from this recovery drive will lead directly to WinRE, where USB functionality is restored.
Tips
If your system remains stable post-update, while uninstalling it may not be necessary, users concerned about the situation can consider the following steps:
- If Windows is still functioning normally:
- Navigate to Start > Settings > Windows Update.
- Select Update history > Uninstall updates.
- Locate the update labeled KB5066835 or one installed around October 14, 2025.
- Select it and click Uninstall to restore USB input in WinRE.
- If Windows fails to boot or access the normal desktop:
- Utilize WinRE (if you can navigate using keyboard shortcuts) by selecting Troubleshoot > Advanced options > Uninstall Updates.
- Opt to uninstall the latest quality update, which is the problematic patch.
As the situation unfolds, it is advisable to stay alert for Microsoft’s forthcoming fix, as the company has yet to provide a specific timeline for resolution.
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