Help me please

First of all sry 4 my english .

So .. Ibought a AMD Phenom II X2 560 Black Edition 3.30GHz with a Gigabyte GA-990XA-UD3 and i tried to unlock my CPU . I tried the easyest way , just went in bios and unlocked the cpu cores and i restart . Everithing was ok , it booted but after 1 min of prime my computer has frozen . I tried to push some voltage but the problem persist . After some documentation i heard i must have in my bios ACC "advanced clock calibration" and from there i cand see witch core makes problems . I went to bios again but i couldnt find that option so i updated my bios from f2 to last version f6 . I restarted but that option didnt appear. I downgraded the version from f6 to f5 but same , ACC doesnt appear . Please tell me what to do , how to get that "ACC" option in my bios . I really want to gent my CPU unlocked . Thanks and sry again 4 my english .

Hi and welcome to Tom's forum.

Try with ctrl + F1 as soon as you enter in BIOS

Try with the Gigabyte's support, they can give you exact answer.