I was in the market for a new processor and came across this locked beauty. After much debate, I took the chance and bought one for under 90$. Now, I'm either one of those unlucky few that get one that can't be unlocked or I'm just doing something wrong. When I try unlocking it on my ASUS M4A78T-E with ACC and Unleashing Mode set "4 core operation" my mobo will boot up 3 times and finally come up as a Phenom II x4 55 BE but with only 3 cores and threads under CPU-Z. When I go back and check Unleashing Mode's option, it switches back to a "3 core" type deal. On my MSI 790X-45G the core can't be unlocked from neither the "Core Unlocker" option or ACC. This motherboards BIOS doesn't have an Unleashing Mode either so I can't try that option. Am I doing something wrong or did I get a 555 with a faulty 4th core? Any help would be appreciated guys.