bleepingcomputer[.]com/news/microsoft/microsoft-february-2026-patch-tuesday-fixes-6-zero-days-58-flaws/
bleepingcomputer[.]com/news/microsoft/windows-11-kb5077181-and-kb5075941-cumulative-updates-released/
bleepingcomputer[.]com/news/microsoft/microsoft-releases-windows-10-kb5075912-extended-security-update/
I had Major issues installing the Win11 update on one device, an older Dell AIO PC.
In another post about Microsoft updating secure boot certificates I included the compatibility test for the certificate update that Microsoft published. On compatible devices that test resulted in the new certificate being deployed. This AIO was not compatible. Running that test however did change the registry entries that the secure boot update uses to determine if it proceeds or not. The PowerShell script that actually performs the update runs automatically with Windows. I have no idea if this had anything to do with my problems installing the update, but wanted to include that info in this post in case anyone else suffers similar issues after performing the test procedure.
Installing the update went as usual until the Windows restart -- after rebooting it said it found Windows in an unstable state and reverted back to the way it was before the update. I then downloaded & ran the update from the catalog -- note the catalog lists two files, the smaller one intended for Copilot+ devices. That failed with no reason given. So I tried a more-or-less shotgun approach, reinstalling Win11 while running Win11, which fixes *almost* any and every problem. That seemed to proceed normally, but ultimately failed (!). I then restored a complete disk image backup created just after January's update, and then, after turning off secure boot just in case, I ran the downloaded update, and that worked. Win11 automatically ran the secure boot update script, which changed the related registry entries. After the update completed I turned secure boot back on, and everything *seems* OK so far.
One person having problems with a Windows update on one device is not necessarily a trend, and may or may not hint at a bad update. That said, Neowin posted an article highlighting anecdotal problems with February's update that hopefully no one else experiences.
neowin[.]net/news/windows-11-update-kb5077181-is-causing-critical-boot-loops-for-some-users/
"Today is Microsoft's February 2026 Patch Tuesday with security updates for 58 flaws, including 6 actively exploited and three publicly disclosed zero-day vulnerabilities.This Patch Tuesday also addresses five "Critical" vulnerabilities, 3 of which are elevation of privileges flaws and 2 information disclosure flaws."
"25 Elevation of Privilege vulnerabilities
5 Security Feature Bypass vulnerabilities
12 Remote Code Execution vulnerabilities
6 Information Disclosure vulnerabilities
3 Denial of Service vulnerabilities
7 Spoofing vulnerabilities"