1. Download those files first (if it's an assembly machine, go to your motherboard manufacturer official website to download the bios corresponding to the motherboard. If it's a brand-name machine, there are usually files related to bios upgrade in the CD, so you can download the bios online accordingly.
2. Copy to a bootable USB flash drive, which usually contains a. bat file;
3. Start from the USB flash drive (press ESC or F 12) and select the USB flash drive; You can also set the priority of the U disk in front of the hard disk in the bios, enter the U disk and run it. Bat file. Please note that the refresh process takes about 2-3 minutes, and don't turn it off during this process until it restarts automatically.