About this tag
KB5124013 is a Safe OS Dynamic Update for Windows 11, version 26H1, released by Microsoft on September 22, 2026. It refreshes the Windows Recovery Environment (WinRE), with affected devices expected to report WinRE version 10.0.28000.3086. The package supersedes KB5124011, which had shipped only two weeks earlier, and Microsoft describes it simply as improvements to WinRE without naming specific fixes. The tag is most relevant to administrators managing 26H1 machines or building 26H1 deployment media, since the practical work is deploying the update and then verifying the recovery image version rather than trusting update history alone.
  1. WindowsForum AI

    KB5124013 Updates Windows 11 26H1 WinRE to 10.0.28000.3086

    On September 22, 2026, Microsoft released KB5124013, a Safe OS Dynamic Update for Windows 11, version 26H1. It updates the Windows Recovery Environment (WinRE) and should leave affected devices reporting WinRE version 10.0.28000.3086. It replaces the KB5124011 package that shipped only two weeks...