L502X BIOS revision A12 bug in VT-x

Yesterday I was trying to boot a VM with VirtualBox and an error message saying "VT-x features locked or unavailable in MSR" was appearing. So I checked in several forums solutions for the problem and all of them suggesting to enable virtualization in BIOS config. So I went to my BIOS config and it was already enabled, but apparently not operational. So I downgraded to A11 revision and could boot my VMs normally.