Computer won't get past OS screen after unlock, even if I am still using 2 cores

>Phenom II x2 555 BE
>MSI 870a-g54
So I decided to unlock my CPU and have been experiencing a problem. I recently found out that if I even have "unlock core" function enabled in BIOS, even while running it with two cores, the computer won't get past the windows screen. With four cores enabled it obviously does the same. No matter what I try I cannot get past the Windows screen while having the unlock core function enabled.
My BIOS isn't on the latest version. I tried flashing it but I couldn't start it up even after flashed, it gave me the same problem described above. I reflashed it to the version I'm on now and it works, but I still can't unlock. What gives?
Any help would be appreciated.
TL;DR: PC will run as Phenom ii X2 555, but not as Phenom ii x4 B55. Can't get past windows screen.

you need to provide more vcore to the cpu
first try to enable 1 core (core number 3) (disable core number 2 and 4) and increase some vcore. If booted then you have a good core.
Then try this with other core (core number 4) (disable core number 2 and 3), if booted then your both cores are unlockable and are good core (i.e, not defective)
then you can try all cores at same time with some voltage increase (vcore)

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!http://i50.tinypic.com/izvwo1.gif!

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