"Microsoft has confirmed a bug that disables USB mice and keyboards in the Windows Recovery Environment (WinRE) after installing security update KB5066835, released October 14. The bug affects Windows 11 version 25H2 (2025 Update) users only when accessing WinRE - the diagnostic toolset used to troubleshoot boot failures. USB devices work normally in Windows proper. WinRE can be accessed when Windows fails to start multiple times, or manually by interrupting the boot process twice (holding the power button before Windows loads)."
"Microsoft said engineers are developing a fix to be released "in the coming days." This offers little comfort to users already stuck trying to troubleshoot PC problems with nonfunctional input devices. This particular snafu echoes Windows 95's early USB support, when BIOS firmware lagged behind the OS, leaving users with USB keyboards unable to access BIOS settings without digging up legacy PS/2 keyboards."
Security update KB5066835, released October 14, disables USB mice and keyboards in the Windows Recovery Environment (WinRE) on Windows 11 version 25H2 (2025 Update). USB devices continue to function normally within Windows but become nonfunctional when accessing WinRE, the diagnostic toolset used to troubleshoot boot failures. WinRE is entered automatically after repeated startup failures or can be reached manually by interrupting the boot process twice. Microsoft said engineers are developing a fix to be released in the coming days, leaving users currently unable to use input devices while troubleshooting. Additional issues include smartcard authentication failures, Windows Update Standalone Installer errors from shared folders, and potential IIS-dependent server application failures.
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