That can happen with a routine Windows 11 feature update, but it's especially frustrating when you're trying to install Windows 11 on an older PC. Over the years, I've had a lot of practice with this ...
If you are encountering the 0xC1900101-0x40021 Windows 11 upgrade error, execute the solutions given below. An outdated BIOS is the primary cause of the 0xC1900101 ...
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