How does windows8 enter PE system

1. Boot up and press “F2” to enter the BIOS and select Advanced. Change “Fast BIOS Mold” to “Enable” to “Disabled” and then enter Boot.

2. Select secure Boot to “Enabled”. Modified to Disabled, after which, the option of OS mode selection will be popped up in "secure boot";

3, change "UEFI OS" to "CSM OS", then press F10 to save and restart Press F10 and select USB to start, you can enter PE.

4, after entering the PE to complete the modification, restart the computer, it is recommended to press F2 again to enter the BIOS to restore the default, otherwise it may not be able to boot.