Microsoft Urgently Patches Windows 11 Bug Disabling USB Keyboards in Recovery Mode

Microsoft has released an urgent update to fix a critical bug in Windows 11’s Recovery Environment (WinRE) that rendered USB keyboards and mice unusable after the October 2025 security update. If you have not updated your PC with the latest patch, you should do so immediately to restore reliable access to essential recovery tools.

What Happened: The WinRE Input Bug

The trouble began with the release of Windows 11 cumulative update KB5066835 on October 14, 2025. This update, intended as a routine security rollup, introduced a severe bug: USB devices—including keyboards and mice—would stop working within the Windows Recovery Environment. While these peripherals continued to function normally after logging in to Windows, they became completely unresponsive inside WinRE, effectively locking users out of crucial repair and recovery options[1][2][6].

WinRE is not just a niche tool; it is vital for troubleshooting, repairing, or resetting your PC—especially if Windows fails to boot normally. It provides access to utilities like Startup Repair, System Restore, and advanced troubleshooting terminals. With USB input broken, many users found themselves unable to navigate or select any options if they needed to recover from a major system issue[1][2][4].

Who Was Affected

• Windows 11 users on versions 24H2 and 25H2
• Windows Server 2025
• Anyone who installed KB5066835 and relies on USB input devices in the recovery environment

Some users with older PS/2 keyboards/mice or touchscreens could still interact with WinRE, but these are rare exceptions in most modern setups[2][4].

Why the Bug Is Dangerous

With WinRE unusable, users facing boot failures, malware infections, or other severe system issues had no way to perform recovery actions unless they had alternative input methods. This left many essentially locked out of their own PC’s last line of defense[2][4].

Further compounding the issue, this bug arrived just as Microsoft ended support for Windows 10, pushing many users to upgrade to Windows 11—only to encounter a critical reliability failure in the new OS’s recovery tools[2].

Microsoft’s Response: The Emergency Patch

After widespread reports and confirmation of the issue, Microsoft moved quickly to address the problem. On October 20, 2025, they released an out-of-band emergency update: KB5070773[3][4]. This patch restores full USB keyboard and mouse support within WinRE for affected versions of Windows 11 and Windows Server 2025.

Microsoft recommends all users immediately install the latest updates, as future rollups will also include this fix[3][4]. If you missed the emergency patch, simply checking for updates in Windows Update will eventually bring your system up to date.

How to Apply the Fix

If your PC still boots normally:
1. Open Settings.
2. Go to Windows Update.
3. Click Check for updates.
4. Install the latest updates, including KB5070773 (or any cumulative update released after October 20, 2025)[3][4].
5. Reboot your PC.

If you are stuck in WinRE and cannot use your USB keyboard/mouse:
– Try a PS/2 keyboard/mouse if your hardware supports it.
– Use a touchscreen, if available.
– Create and boot from a USB recovery drive.
– Enterprises can utilize Preboot Execution Environment (PXE) booting for recovery[4].

What If You Don’t Update?

Failing to apply this update leaves your system vulnerable if you ever need to use WinRE. Without working input devices, you will be unable to:
– Repair startup issues
– Perform a system reset or restore
– Access command prompt or advanced troubleshooting
– Recover from malware or corruption that prevents Windows from booting

If your system experiences a boot failure, you could be completely unable to recover it without external tools or professional help[2][4].

Lessons and Takeaways

This incident highlights the critical role WinRE plays in Windows reliability—and the importance of keeping your system updated. It also underscores the need for Microsoft to strengthen update testing, as this was the second major WinRE failure in recent months[4].

Key takeaways:
– Always install Windows security updates promptly, but monitor for urgent patches if problems arise.
– Keep alternative input devices (like a PS/2 keyboard) handy if possible, especially on older hardware.
– Consider creating a Windows recovery drive in advance, in case you ever need to repair your system[4].

Final Advice: Update Now

Install the latest Windows updates immediately to ensure your recovery tools work when you need them most. The fix for the WinRE USB input bug is available now, and future cumulative updates will keep you protected[3][4].

Staying proactive with updates means you won’t be caught off guard by critical system failures—and you’ll have full access to the recovery tools that could save your PC.

Original source: Lifehacker – Update Your PC Now to Patch This Windows RE Bug