Bios Mods -The Best BIOS Update and Modification Source

Hello there, i`ve got a problem with my Asus motherboard, like in title i cant do any oc on it. I was exploring asus bios (using tool) and ive seen that OC options are inside the bios but i cant get access to them (i tried alt+f4/alt+f1 etc.). I was trying to unlock OC options on my own hand but i failed. I`d be really happy if someone here will help me in unlocking the bios (straightly i mean - someone will unlock it for me, since i failed on it).

Here is page where u can download bios for my motherboard
http://www.asus.com/us/Motherboards/P7H5..._Download/
Currently im using i3-540 but propably will change it for i5-750. Im using 709 bios version.
Thanks in advance for any help you are able to provide.

I know that this MOBO is old enough. But could anybody help to make unlocked bios to enable overclock features. I know that some people flash bios from p7h55m-lx and it works, but without lan adapter.

link to original bios:
https://www.asus.com/ru/Motherboards/P7H...Desk_BIOS/