Following the recent release of KB4041676 and KB4041691 for Windows 10 and Windows Server 2016 there have been reports that following the install of the update the machines are no longer able to boot.

The issue appears to stem from installing the delta update and cumulative update on the same machine, normally this is unlikely however this month an unfortunate mistake Microsoft’s end resulted in both updates being published to WSUS and Configuration Manager that could be installed on the same machines together. (The delta update was added to WSUS without administrators specifically adding it)

For those unfamiliar with the Delta update this is Microsoft’s way of reducing the size of the cumulative update which since the move to the new update format have been very large in size due to containing the necessary fixes from the previous months updates. Delta updates are smaller because they contain only the changes between the current months windows 10 cumulative update and the previous months update.

Since SCCM 1702, Configuration Manager has supported express installation files (Delta updates) for windows 10 updates. This is explained in the following article:

Ensure you do not deploy the Cumulative and Delta updates to the same Machines, should this be the case Microsoft state:

“If you approve and deploy the same version of the Delta and Cumulative update, you will not only generate additional network traffic since both will be downloaded to the PC, but you may not be able to reboot your computer to Windows after restart.”

The recovery procedure can be found in the same blog below:

Any customers receiving updates direct from Windows updates are unlikely to be affected due to Windows 10 enterprise devices requiring Windows Server Update Services (WSUS) to take advantage of Express updates.

We are of the understanding that the initial mistake Microsoft’s end has now been rectified as of the afternoon of 10/10/2017 so only early adopters are likely to be affected.