Hi,
Just been reading this topic, cause i had problems unlocking the 2nd core on my brand spanking new Sempron 140 using a new
GA-MA78LMT-S2 (rev. 3.4) (both of these components bought yesterday).
This may not help but it worked for me. In order to get it unlocked i have used the following method (i have the latest F13 bios for this board):
1. Set fail-safe Bios settings => Save & Reboot
2. Set Hybrid EC mode in M.I.T => Save & Reboot
3. Set ACC to auto => Save & Reboot
4. Second Core unlocked! (showing Athlon II instead of Sempron 140 at POST!)
Right now im gonna check if its stable, currently writing this post on the untested, but unlocked
Athlon II X2 4400e!