If your Windows PC is stuck in Diagnostic Startup mode, force Normal Boot via Command Prompt or disable PIN-only sign-in via Regedit.

Windows 11 is getting a very useful troubleshooting feature that can help you fix PCs that cannot boot, and you can already try it out.

New Windows 11 build adds self-healing “quick machine recovery” feature New recovery mode lets Microsoft fix "widespread boot issues" affecting PCs.

Repeat this process 3 times. After the 3rd reboot, Windows should enter Recovery Mode automatically. From the Recovery Mode, navigate to Troubleshoot > Advanced options > Uninstall Updates.

Microsoft warns that the August security update can prevent Windows 10 and 11 PCs from initiating a factory reset or recovery ...