Fix 0xC1900101 – 0x40021 Windows 11 Upgrade error

If you are experiencing Error 0xC1900101-0x40021, The installation failed in the SECOND_BOOT phase due to SYSPREP_RESPECIALIZE operation when upgrading Windows 11, you are not alone. This error indicates that the installation has got stuck right before the final setup stage. The good news is that this is almost always fixable. In this article, we will […]

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