1. The hotkey for this brand of motherboard is F12.
2. The specific operation method is as follows:
a. Insert the prepared USB boot disk into the USB socket at the rear of the computer main box, and then turn on the computer.
b. After the startup screen appears, press the "F12" key continuously, and a window for selecting startup items will pop up!
The following figure shows the startup screen:
The following figure shows the startup item selection window that pops up after pressing the F12 key: