ASUS Rampage Extreme - unlock hidden settings

Hello,

I`m trying to unlock VT-d on my board ASUS Rampage Extreme, but this setting missing from BIOS. Mainboard chipset (Intel x48 chipset) is VT-d capable, just must enabled from BIOS. Can any help me to unlock my BIOS? Last 3 BIOS versions is attached to this post.

Thank you in advance!

  Rampage-ASUS-Extreme-1301.zip (Size: 896.09 KB / Downloads: 0)

  Rampage-ASUS-Extreme-1202.zip (Size: 895.96 KB / Downloads: 0)

  Rampage-ASUS-Extreme-1201.zip (Size: 895.92 KB / Downloads: 0)