How do I recover a corrupted BIOS using ASUS CrashFree BIOS 3?
Download the latest BIOS file from https://www.asus.com/support/, rename it to ASUS.CAP or PB660PD4.CAP, and copy it to a USB flash drive. Turn on the system and insert the USB drive; the utility will automatically detect and read the BIOS file, then enter ASUS EZ Flash 3 automatically to begin recovery. After recovery, press F5 to load default BIOS values to ensure system compatibility and stability. Do not shut down or reset the system during the update.
From the official ASUS Prime B660 Plus D4 Motherboard manual, page 28
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