Bios Mods -The Best BIOS Update and Modification Source

Hi all,
it's my first time here. I've recently installed a SSD to my Asus ET2011E and had to assert that i can't change the onboard sata mode in bios settings to AHCI. It's on IDE mode atm and greyed out. If someone can help me to unlock this feature I would be very happy because I could gain some speed in disk access. Thank you in advance.

My System:
Asus All-In-One ET2011E
SATA Controller: Intel G41/ICH7

Link to BIOS file: http://dlcdnet.asus.com/pub/ASUS/Digital...E/0306.zip

I add a couple of pictures hoping someone will help me.