How do I enter the BIOS Setup on the ASUS Prime Z390-A?
To enter BIOS Setup at startup, press the Delete key or F2 during the Power-On Self Test (POST). If POST has already completed, you can press Ctrl+Alt+Delete simultaneously, press the reset button, or power the system off and back on, then press Delete to enter BIOS.
From the official ASUS Asus Prime Z390 A Motherboard User manual, page 64
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