Windows 10 failed to upgrade to 21H2 - error 0x80004005-0x1000A The installation failed in the DOWNLEVEL phase with an error during PREPARE_FIRST_BOOT

J

j2bmw

Hi,I have been trying using Windows Upgrade Assistant to upgrade my Windows 10 to 21H2. It failed with the following error:The error code is 0x80004005 - 0x1000AThe installation failed in the DOWNLEVEL phase with an error during PREPARE_FIRST_BOOT operation.I have visited similar questions on internet, but I haven't been able to fix my issue. I tried to follow How to Rebuild Windows Boot Configuration Data (BCD), but the Command Prompt option is not available from Advanced Start-up options > Troubleshoot (with Advanced options) on my PC. I only have Exit to AOMEI Winddows

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