Windows 11 Installation Error Error Code: 0xC1900101 0x40021

  • Thread starter Thread starter Felix Juliadi
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Felix Juliadi

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I tried upgrading Windows 10 to Windows 11 using "Check for updates Menu in Settings" and "Windows Installation Assistant" but both fail at the end with the error:Error Code: 0xC1900101 0x40021The installation failed in the SECOND_BOOT phase with an error during SYSPREP_RESPECIALIZE operationI read a thread about this error and said to generate a new thread because each PC got different solution.Please Help...The pc is fully compatible in the pc Health Check WIndows 11 requirements.

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