Microsoft has released an out-of-band (OOB) update to patch an issue related to Windows 11's Recovery Environment. Users had reported a major bug that was introduced in this month's Patch Tuesday update.
KB5066835, which was released on October 14, 2025, had a couple of known issues, one of which was related to USB devices not working in the Windows Recovery Environment (WinRE). This issue affected keyboards, mice, which prevented users from performing recovery options in WinRE. That sounds like a proper nightmare, if you had trouble with Windows, you could be stuck on the recovery screen that didn't register any input from the user.
A week after the update was released, Microsoft has announced that KB5066835 is now available as an emergency out-of-band update to address the problem. It is a cumulative patch, so it contains all the security fixes, updates that were shipped in the previous update. Here's the page on Microsoft's support portal that has the release notes for the latest update.
While it may have fixed the WinRE issue, the update does not bring a solution for the other known issue, that came to light over 2 months ago. At the end of August, Microsoft released KB5064081 as a Windows non-security preview update, which was later bundled into the September Windows Update. This patch resulted in the following issue, "some Digital TV and Blu-ray/DVD apps might not play DRM content". It affects apps that use Enhanced Video Renderer with HDCP enforcement or Digital Rights Management (DRM) for digital audio. Playback may fail, or be interrupted frequently, or display black screens or copyright protection errors. While it partially addressed the HDCP enforcement in September's update, the issue isn't fully patched. It is unclear whether Microsoft will resolve this problem.
The KB5066835 update is available for Windows 11 version 24H2 and 25H2 via Windows Update. Some users say that the update is not being installed, they are running into some errors. You can download it manually from the Microsoft Update Catalog to see if that helps.
Did you run into the WinRE issues?
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