For Everyone's information: It looks like Microsoft forgot to make this update available https://support.microsoft.com/en-us...ning-support-requirement-for-windows-and-wsus for Windows 7 Embedded OS which installs the ability to use SHA-2 code signing. As soon as the Aug 2019 security rollup update is installed, " KB4512506 " upon reboot, the OS indicates " Windows cannot verify the digital signature for this file " which of course is caused by the lack of the SHA-2 code sign support. https://support.microsoft.com/en-ca/help/4512506/windows-7-update-kb4512506 I've had two NVR's go down due to this issue. Exact error that appears on the screen after OS reboots: File: \Windows\system32\winload.efi Status: 0xc0000428 Info: Windows cannot verify the digital signature for this file. The work around for now is to to edit BCD using the switch nointergritychecks 1. See this youtube video for further instructions.