Lenovo Z51 70 bios unlock

Hello everybody 

I am new in this great forum.

I have Lenovo 751 70 with insydeh2o bios latest update

need to unlock the menu  or advanced to change the dvmt to 96 mb or 128 mb for hackintosh

it cant be done through the efi shell because the bios is locked

this is the original bios download page

http://support.lenovo.com/gb/en/downloads/ds102767

searching for unlocked bios in ur forum but it is not found 

the system has intel 5500 hd graphics 

hope someone can help me

Thanks a lot