D54250WYKH with 0028 BIOS, access to "Processor cores" settings

Hello,

I have problems accessing in my D54250WYKH a setting "Processor cores" in BIOS 0028 under "Performance" tab.

If I click on the Cores link nothing happens on the right side where settings should "Processor cores" appear.

I see only this screen:

This one I cannot see,even when I press on Cores link.

Is this disabled in version 0028?

Thanks for the a answer.