Short answer is: Alt + F2
BIOS ( Basic Input/Output System) is needed when you want to change security settings or boot order or other system wide settings in general. Accessing BIOS on a Asus laptop is a bit different than on other machines since keys like F1, Esc or Del won't work.
Here's the complete guide:
- Turn Asus laptop on.
- During splash screen hit keys Alt + F2 (several times - just to make sure the machine receives the input)
- Enter BIOS.