Enable and configure the network boot (PXE)

3. BIOS Award

To enter Award BIOS, press the "DEL" key.
Note : To find out which key should be pressed, just look at what is written under the logo of the motherboard at the bottom of the screen.

For example, with this Gigabyte motherboard, the boot menu is accessed by pressing the "F12" key and the BIOS configuration by the "DEL" key.

In the Award BIOS (old BIOS), go to the "Integrated Peripherals" menu.

Then, locate the line "Onboard LAN Boot ROM" and press "Enter".

Select "Enabled".

And finally, don't forget to select "Legacy LAN" as the first boot device.
Note : To learn how to change the boot order in BIOS Award, see point 2 of the tutorial : "Change the BIOS boot priority".

Finally press "F10" to save the changes.
And answer "Y" when the confirmation message is displayed :

Your computer will restart first on the network (PXE).