Same problem here.
I have a Z77X-UD5H, tried to connect to every HDD port, set it to AHCI (default) IDE and RAID but disk utility won't recognize my HDD. I used Unibeast 1.4 and Bridge Helper 5.
The problem is probably that I used an old Install Lion app (10.7 IIRC). I'll try to buy a newer version through the app store and create the installation media again and report back here.