Microsoft has pulled one more buggy Windows 10 servicing stack update, KB4601390, because it blocked customers from installing this month’s security and Cumulative Updates. The issue was first observed by users who tried installing the February 9 security updates on Windows Server 2016 and Windows 10, version 1607. Microsoft resolved the update installation problems by releasing a new. SSUs provide servicing stack fixes, the component used by Windows 10 to download and install updates correctly. KB5001079 is now available through the Microsoft Update Catalog.
Source: https://www.bleepingcomputer.com/news/microsoft/microsoft-pulls-a-second-windows-ssu-for-blocking-security-updates/