Toshiba Satellite C870/C875/L870/L875 unlock

Hi, I'm struggling to find any answer in the internet, so last hope writing here, just need to unlock some additional BIOS options so I can change video card dedicated memory to a bigger value.

Hope you can help me with that.

ACPI Flash BIOS version 6.70 for Satellite C870/C875/L870/L875

http://support.toshiba.com/support/model...=9c231583r