How does Gigabit motherboard bios set the startup disk?

There are two ways to set USB flash drives for Gigabit motherboards:

The first type: insert the USB flash drive first.

① Press the power button, and immediately press the del button to enter the bios, as shown in the figure.

(2) Click bios functions and click "Boot Option # 1" to set it as a USB flash drive model. After setting, press F 10 to save and exit, and then boot with a USB flash drive.

Type 2: Insert the USB flash drive first.

Press the power button, immediately press the F 12 key, bring up the startup menu, and select the USB flash drive model to start.