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Microsoft has released an out-of-band update for Windows 10 Enterprise LTSC 2019, Windows 10 IoT Enterprise LTSC 2019, and Windows 10 IoT Core LTSC to resolve an issue that was introduced by the August 2025 security update (KB5063877), which resulted in failures during device reset and recovery attempts. This update is advised for individuals who have experienced this issue.



August 19, 2025—KB5066187 (OS Build 17763.7683) Out-of-band - Microsoft Support

This out-of-band update includes fixes and improvements that are a part of the following update:

The following is a summary of the issues that this update addresses when you install this update. The bold text within the brackets indicates the item or area of the change we are documenting.

  • [Fix for reset and recovery issue] This update addresses an issue introduced by the August 2025 security update ( KB5063877) in which attempts to reset and recover the device fails. This issue happens when users perform one or more of the following processes: 

    For more information on this issue, see its documentation on  Windows release health. We recommend you install this optional OOB update if you have encountered this issue. If your system isn’t affected or you don’t plan using the methods described above, you can choose not to install the update.


August 19, 2025—KB5066187 (OS Build 17763.7683) Out-of-band - Microsoft Support