1 Press F12，enter Boot Menu. In this point , choose "USB HDD" is invalid.

2 Press Tab to get in "App Menu", then choose "Setup" to go to BIOS Setup page.

3 Go to "Secure Boot" LOV, change it to "Disabled".

4 Go to "Startup" menu, change "UEFI/Legacy Boot" to "Legacy Only", and change "CSM Support" to "Yes".

5 Go to "Boot" LOV, enter it, move "USB HDD" to top, then F10 to save it. Restart.

1 Press F12，enter Boot Menu. In this point , choose "USB HDD" is invalid.

2 Press Tab to get in "App Menu", then choose "Setup" to go to BIOS Setup page.

3 Go to "Secure Boot" LOV, change it to "Disabled".

4 Go to "Startup" menu, change "UEFI/Legacy Boot" to "Legacy Only", and change "CSM Support" to "Yes".

5 Go to "Boot" LOV, enter it, move "USB HDD" to top, then F10 to save it. Restart.