Hi all, here is Ottorino from Florence, Italy.
Here on Debian Jessie Linux I was not able to update the firmware no matter how compulsively measure the two seconds, no matter if the usb cable was inserted before or later in the computer !!
I finally succeded to update the firmware to 2.0.7.
Apparently the problem was the 3.0 USB plugs (the blue ones) on my fujistu.
Performing the upgrade procedure with standard usb, I encountered no problems at all.