Lenovo G500, Bios: 78CN25WW

Hello,

I was searching for hours on how to unlock the "advanced" menu in the bios of my laptop Lenovo G500 with bios version 78CN25WW.

I need it so that i can activate the switchable graphics option located in the "advanced" menu of the bios. Picture of my bios

Here is the bios from the lenovo support website: Link

Thank you very much!