I'm running Windows 10 on an Asus X555LA. I want to be able to adjust the volume by simply pressing F11 and F12 rather than Fn + F11/F12. I have seen similar posts but none of the solutions seem to work for me (like pressing fn + esc or Fn+Num Lock etc.)
It seems like that won't be possible with an Asus laptop not unlike with a HP laptop you can lock the fn key. Please refer to this thread regarding the same question you have. Some suggested to use 3rd party software to bind keys.