Phoenix Technologies stopped providing direct consumer BIOS updates years ago. Today, the 6.00 PG BIOS is distributed via:
Write down the full string (e.g., 6.00 PG-09A-01KF-XXXX ). phoenix technologies ltd 6.00 pg bios update
If you just need to change settings or the boot order rather than updating: phoenix technologies ltd 6.00 pg bios update