Hi. I just flashed my bios to one which has EC firmware hybrid mode, and my mobo, GA-MA770-UD3 rev 2.0, has SB710, so I can potentially unlock my Phenom x2 550 BE. I set it to hybrid and ACC to auto. Firmware gave me a warning not to reset or turn off as it updates firmware. After it updated, I couldn't get into windows, so I turned off ACC and put hybrid back to normal and everything is fine again. Can you tell me what other settings I should try in bios (see my pics) to see if I can unlock and get into windows? I have a stock cooler, and since updating bios, cpu now idles at 45 to 48C, instead of the 36 to 39 from factory set bios. If I can't unlock cores, I might as well go back to factory bios since my cpu temps were lower, right? Many thanks! 
Couple of pics I took before flashing to bios with EC firmware.
http://img4.imageshack.us/img4/6596/imgp2477.jpg
http://img215.imageshack.us/img215/166/imgp2478.jpg
Couple of pics I took before flashing to bios with EC firmware.
http://img4.imageshack.us/img4/6596/imgp2477.jpg
http://img215.imageshack.us/img215/166/imgp2478.jpg