How do I update my ASUSTeK motherboard BIOS using a USB drive?
To use ASUS EZ Flash 3 to update your BIOS via USB: Insert the formatted USB flash disk containing the latest BIOS file. Enter Advanced Mode in BIOS Setup and select ASUS EZ Flash 3 Utility, then locate and load the correct BIOS file for updating before rebooting. (Page 27)
From the official ASUS Prime B660 Plus D4 Motherboard manual, page 27
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