Update Windows 11 Insider Preview Feature Update (26220.7934)

Temporarily disconnect all unnecessary peripherals (USB drives, printers, external storage). Then attempt the update again, as some peripherals can interfere.

The error code 0xc1900101 during a Windows 11 Insider Preview Feature Update (26220.7934) typically indicates a driver or hardware compatibility issue, or a problem with the update process itself.

What do you have installed currently. What channel are you on?

Have you considered posting at https://learn.microsoft.com/en-us/answers/tags/953/windows-insider