Unlocking 3rd and 4th cores on phenom II x2 545BE

[sanjayk111]

Hey guys i wanted to know if i could unlock da "disabled cores" on the phenom II x2 545BE

My cfg:
Phenom II x2 545 BE 3.0ghz
Asus m4a78-em/1394
4 gb memory 800mhz
320Hdd
CoolerMaster Xtreme Power 600W

I had read smwhere dat i would have to update my bios... but wasnt clear about it.. PLease help me....would be glad for suggestions

 

[sanjayk111]

And it would be helpful to know wat version of bios would be needed??