(1) Step 1: Press F2 continuously to enter the BIOS during the boot process, use the arrow keys to select the boot, and then find the boot list option to change UEFI to legacy mode, save it in secure boot to enable, F 10, and select Y.
(2) Step 2: Change the hard disk mode: switch the IDE to ahci mode, press F2 to enter the BIOS, use arrow keys to select Advance, then find ACHI mode in SATA operation selection, press F 10 to save, and select Y. ..
(3) Step 3: The method for setting priority startup of the U disk is as follows:
1: ? First, insert the U disk startup disk into the USB interface of the computer, then start the computer, and immediately press the F 12 key, which is called the shortcut key for starting startup items. At this point, a startup menu (Boot? Menu) interface, you only need to use the direction keys to select USB HDD: mass storage device as the first boot, and some brands are USB HDD: Kingston DT 10 1G2? Or general sd/mmc? (The display here will be different depending on the motherboard), and then press enter to confirm, you can start the USB flash drive reinstallation system.
2. One of the biggest advantages of this method is that after reinstalling the system, don't change the startup item of the U disk back to the CD-ROM drive or hard disk, which is only effective at present and will be invalid after restarting. (Motherboards now have this function. Motherboards before 2004 did not have this function, and it should be set in the BIOS. )
The following figure shows how to set the USB flash drive to start with shortcut keys: