Microsoft published a standalone security update for Windows 10, KB4524244, on the February 2020 Patch Tuesday. The security update addressed "an issue in which a third-party Unified Extensible Firmware Interface (UEFI) boot manager might expose UEFI-enabled computers to a security vulnerability" according to Microsoft.
The update was released for Windows 10 versions 1607 to 1903. Cumulative updates installed on February 11, 2020 or any other update installed on that day are not affected by the issue according to Microsoft.
Confirmed user reports about system freezes, boot problems, and installation issues started to emerge after the release of the standalone update; Microsoft made the decision on February 15, 2020 to pull it from Windows Update, WSUS, and the Microsoft Update Catalog website.
Tip: we have published a guide on installing Windows updates manually.
The company updated the support page on February 15, 2020 to inform its customers about the decision:
This standalone security update has been removed due to an issue affecting a sub-set of devices. It will not be re-offered from Windows Update, Windows Server Update Services (WSUS) or Microsoft Update Catalog. Note Removal of this standalone security update does not affect successful installation or any changes within any other February 11, 2020 security updates, including Latest Cumulative Update (LCU), Monthly Rollup or Security Only update.
Microsoft does not detail most issues that users may experience. The known issues section is vague as well but it highlights one issue that users may run into. According to the description, the operating system's "Reset this PC" feature may not work correctly after installation of the update. Affected users get "there was a problem resetting your PC" error messages during the process.
Reset this PC is used to reset the PC to a baseline. Customers are asked to remove the update KB4524244 from devices if they are affected by any of these issues.
- Select the start button or Windows Desktop Search and type update history and select View your Update history.
- On the Settings/View update history dialog window, Select Uninstall Updates.
- On the Installed Updates dialog window, find and select KB4524244 and select the Uninstall button.
- Restart your device.
Reset this PC should work again after the problematic update has been removed successfully from the machine.
Note that Microsoft has not updated (some?) localized versions of the support page yet. The German page does not contain the update; this once again shows that users and administrators need to consult the English version of support pages to make sure the information is up to date.