BIOS access

Users are experiencing issues accessing BIOS and Safe Mode after installing the October 2025 update KB5066835, which has rendered input devices like keyboards and mice non-functional during the Advanced Startup environment. Complaints indicate that the update has disrupted essential functionalities, including IIS and localhost. Users have attempted various solutions, such as changing USB ports and disabling fast startup, but these have not resolved the issue. Some users reported success by replacing the problematic Windows Recovery Environment (WinRE) image file with an older version. A workaround to access Safe Mode involves creating a Windows 11 installation USB, booting from it, and using Command Prompt to set the system to boot into Safe Mode. The issue appears to affect systems with USB 3.0-only ports, while some laptops retain functionality with built-in keyboards. Microsoft has not yet acknowledged the problem, but a resolution is expected soon.