REQUEST - advanced option on Acer V5-471

Hi, I need change my graphic card's shared memory on my laptop - Acer V5-471. To do so, the BIOS advanced option need to be unlocked.
Is there anybody to help me with it? Some useful link would help, too.

Thx.

http://global-download.acer.com/GDFiles/...er&SC=PA_4