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並前往https://www.dell.com/support/kbdoc/en-us/000139184/how-to-roll-back-windows-10-upgrade-to-a-previous-operating-system

How to roll back Windows 10 upgrade to a previous operating ...

This feature allows a user to revert back to the previous version of Windows for any reason. After 10 days (30 days in versions of Windows 10 ...

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