What is BIOS back flash?

BIOS Flashback helps you to update to new or old motherboard UEFI BIOS versions even without a CPU or DRAM installed. This is used in conjunction with a USB drive and the flashback USB port on you rear I/O panel.

What happens when you flash your BIOS?

Flashing a BIOS merely means to update it, so you don’t want to do this if you already have the most updated version of your BIOS. … The system information window will open for you to see the BIOS version/date number in the System Summary.