Have just downloaded and installed the new S-Series BIOS (Version : R0071G4)
Didn’t notice any new options in the BIOS itself save for disabling the VAIO boot logo and setting the boot volume (maybe these options were there before - can’t remember?)
Any - so far so good - nothing broken as far as I can tell!
You will need to go to your Sony support website (according to where you live: USA, EU or Asia) and see if it is available for your particular notebook model.