How do I update the BIOS using a USB storage device?
To flash BIOS via USB, you first need to power supply to connect CPU_PWR1 and ATX_PWR1 without installing a processor or memory. Then use a USB storage device that contains a renamed MSI.ROM file placed in its root directory and insert it into the Flash BIOS Port on the rear I/O panel of your computer (Page 53).
From the official Msi Pro Z790 P Wifi Motherboard manual, page 53
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