The installation faile in the SAFE_OS phase with an error during PREPARE_FIRST_BOOT operation

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Fix.

  • Make sure that your device has enough space. Your device requires at least 16 GB of free space to upgrade a 32-bit OS, or 20 GB for a 64-bit OS. For more info, see Free up drive space in Windows 10.

SRC:

https://support.microsoft.com/en-au/help/10587/windows-10-get-help-with-upgrade-installation-errors

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Windows Anniversary Update (1607) To Windows Fall Creators Update (1709) failed - Error 0x80070057 - 0x2000A
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