Asus bios has no legacy mode.

1. You can shut down or restart the computer. When restarting, press F2 of the keyboard to enter the bios interface, and select the boot option of the title option.

2. When we enter the setting interface of boot, we can see that the current option of bootmode in the interface below is uefi, that is, uefi boot mode, and there is no legacy mode in bios.

3. Press ENTER directly on the keyboard to open a new window where you can select the legacy option. Press Enter to confirm your choice.

4. You will see that the bootmode in the interface will become legacy mode. At this time, the mode switch was successful, but it was not completed. If you want to install a new system or a system, you need to have a setup.

4. After setting all the settings, finally press F 10 of the keyboard. In the window of whether to save the changes, select Yes, and then restart the computer. The legacy mode is successfully switched.