Unlocking H81M-K Bios

Hello everybody, I was thinking if someone here can unlock the H81M-K Bios for me?
I am looking for a way to unlock it and add all menus such as BCLK Overclocking etc… alongside a tutorial on how to flash it.

Please help.

https://dlcdnets.asus.com/pub/ASUS/mb/LG…K-ASUS-3602.zip

This is the link to download the bios.