How do I reset the BIOS to default settings on the MSI B550-A Pro?
You can reset the BIOS in two ways: press F6 inside the BIOS to load optimized defaults, or use the JBAT1 Clear CMOS jumper on the motherboard. To use the jumper, power off the computer, unplug the power cord, short the JBAT1 jumper for about 5-10 seconds, remove the jumper cap, then plug in and power on the computer. (Page 49)
From the official Msi B550-A Pro Motherboard manual, page 49
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