Users of affected Mac devices that use Boot Camp attempting the update will see an error message warning about a problem with the Mac HAL driver 'machaldriver.sys' on their Windows 10 installation.
I just finished installing all updates for my company and home and had no issues at all.
I don't use System restore however so I suspect I'll never see anything related to this. I recalled a similar issue from a previous failed Win10 update and decided to try another solution.
In this situation, Windows restores the catalog files and stages the driver files to be restored when the computer restarts.
However, when the computer restarts, Windows loads the existing drivers before it restores the later versions of the drivers.
To be able to circumvent the restart failures caused by this known issue, users may have to either restart two times in a row or use a hardware restart switch.
Once the Windows Recovery Environment is on the screen, follow these steps: Following the steps listed above will allow users to restore the computer to the restore point chosen before the Stop error (0xc000021a) was triggered.
AMI provides a number of support options for its BIOS products, both for its Developer Customers and End Users of AMI's BIOS and UEFI firmware solutions.
Read below to learn more; use the Technical Support Contact Form to contact AMI Technical Support for assistance beyond the options described here.
In order to start the System Restore wizard on computers affected by the restart crashes caused by failed system restores, users have to use Win RE instead of the Settings dialog box.