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FIRST_BOOT phase error

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How to Fix Windows Server 2025 Upgrade Error 0xC1900101 – 0x30018 (SYSPREP_SPECIALIZE Phase)

If your upgrade from Windows Server 2016 Standard to Windows Server 2025 fails with the message: We couldn’t install Windows Server0xC1900101 – 0x30018The installation failed in the FIRST_BOOT phase with…

Posted by WinFix October 13, 2025

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