How to enter a password for BIOS/UEFI in T420?

Hello, I need to delete the UEFI supervisor password, I know what it is. The problem is that I can't seem to ask me this password! By pressing the button Thinkvantage + F1 just request the password works, and I am never asked to enter the supervisor password so that I can activate the parameters of VT & VT - d. This is really critical, I can't run VirtualBox without it.

Can someone explain how to enter? I get to the BIOS settings the wrong way?

Power off, it starts, enter the supervisor password to power on password prompt.

I hope this helps!

Tags: ThinkPad Notebooks

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