To up-date the BIOS Flash, it is mandatory IN ONE SETUP SESSION:
- In the Boot menu be sure the first boot device is the one with the tools;
- Change the following options from setup menu
  - Advanced-->PCH-FW Configuration-->Firmware Update Configuration-->Me FW Image Re-Flash = Enabled;

Once saved, do the up-date procedure at the very next boot: 
After the boot, go to the directory containing the tool for your O.S. and exec
update <BIOSimage.bin>
where <BIOSimage.bin> is the new BIOS signed binary.

Once finished, it is mandatory to power off and then on the system.

