Restore win8 boot press F8 to enter advanced boot mode

  
If you want to restore Windows 8 boot and press F8 to enter advanced boot mode, you can refer to the following method.
Open a command prompt as an administrator and type
bcdedit /set {default} bootmenupolicy legacy

Press F8 to enter advanced boot mode after booting, if you want to restore windows 8 original In some startup modes, just replace the above command with the following.
bcdedit /set {default} bootmenupolicy standard
This method also applies to windows 8.1.

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