[REQUEST] y50-70 graphics unlock

Hi, i want to ask you for a perma bios mod for my laptop lenovo y50-70 (GTX 860M 4 GB).
I want unlock graphics card overclocking core clock more than default. I am overclocking it with MSI afterburn or NvidiaInspector, but default its locked for max +135 mhz core clock and i want overlock it more. Memory overlocking is ok, but core clock is locked. And i want use MSI afterburner or Nvidia Inspector for overclocking (not perma lock core clock), because its save to control it, if its possible to do it like this.

I saw on internet similar perma mod for asus with same graphic.

Is this possible?

PS: I am new in bios modding. btw sorry for my bad english, but i hope you understand me.

My backup bios: https://www.sendspace.com/file/mv9nqo

Thank you in advance for your help.
Merry Christmas,
Paklic