Last summer, after several emails with Fujitsu’s support, they sent me an email with a tool and instructions on how to update the firmware of my iX500 to fix the KRACK WiFi vulnerability that was discovered at the end of 2017. Since - as far as I know - Fujitsu does not advertise the possibility of fixing the vulnerabilty, I wanted to let you know that this is possible.
Fujitsu is able to provide you with a firmware update tool via email. Unfortunately, this tool only runs on WindowsXP/Vista/7/8. Everything else (including Windows 8.1 and Windows 10) does not work. Luckily, I found a friend who had a machine still running Windows 7, so I could go through the installation process (which is just a few simple steps for which they provide good instructions).
Additionally, a support representative told me that you can verify that the firmware has been updated by making sure the version number is “0S00”. You can find it by right-clicking on the ScanSnap icon on your Mac or Windows computer, choosing “Help” and “ScanSnap Information”.