Unlock advanced BIOS (hidden tab) on Ideapad 3 15IMH05
End-state goal : Unlock a screen like the below in my BIOS.
Does anyone know how to achieve that? Tried everything I could google : Fn + Tab (3 x), Fn + R -> Fn + N. and various other magic to unlock 'Advanced' tab in my UEFI.
Motivation : Disable C1E and access CPU Power Management tab (for potential undervolting). The former helped me completely get rid of coil whine (demoe-ed below), thanks to ThrottleStop SW. However, I would like to config the same in BIOS so the fix becomes OS-independent