Hit F2 at power-on to get into the AMI BIOS. This describes itself as the Aptio Setup Utility.
Initially I was a bit confused as, on the 'Main' screen it showed
BIOS Vendor American Megatrends Customised by Fujitsu Core Version 4.6.5.4
and at the bottom of that screen:
Version 2.15.1236
whilst, on going to the Fujitsu support site, I found the latest version to be 'V4.6.5.4 - R1.18.0 (10/07/2018)'.
However, having booted a copy of Tiny Core Linux, when I checked the boot message file I found the line:
FUJITSU FUTRO S720/D3313-B1, BIOS V4.6.5.4 R1.16.0 for D3313-B1x 01/28/2015
....which resolved the problem of the version number of the current BIOS. Having updated the BIOS to R1.18.0 the version numbers on this 'Main' screen remained unchanged.
Why it doesn't show the overall BIOS version number used by Fujitsu I have no idea.
On power-up the F12 brings up a boot option screen which shows a list of whatever bootable items it finds. In this example I had a Sandisk USB pen drive plugged in to one of the front USB ports:
Please select boot device:UEFI: SanDisk Cruzer Blade 1.26 SanDisk Cruzer Blade 1.26 IP4 IP4 Realtek PCIe GBE Family Controller IP6 IP6 Realtek PCIe GBE Family Controller P1: Innodisk DEMSR- 16GB mSATA Realtek PXE B01 D00 Diagnostic Program Enter Setup↑ and ↓ to move selection ENTER to select the boot device ESC to boot using defaults
Some of these options (eg UEFI) will depend on what you've enabled or disabled elsewhere in the BIOS.
Going to the Fujitsu support site it looks the options might be:
Note: Each option has a file with the following information:
Attention!
This Software may only be used for Recovery of a single Fujitsu FUTRO OEM device that was originally ordered and delivered with Windows 10 IoT. If you are not sure please check this on the Microsoft license sticker (COA Label) attached to the device located on the back side of the housing of the thin client.
This prompted me to check further on the back of my S720 where there was a (very) small label that mentioned Windows Embedded Standard (WS7P).
Attention!
This Software may only be used for Recovery of a single Fujitsu FUTRO OEM device that was originally ordered and delivered with WS7P. If you are not sure please check this on the Microsoft license sticker (COA Label) attached to the device located on the back side of the housing of the thin client.Recovery for 8GB, 16GB and 32GB mSata or 16GB NAND flash.
Please extract this downloaded ZIP-file and execute StickWizz.exe to create a bootable recovery USB flash medium.
Plug the USB flash medium into an USB 3.0 Port of your FUTRO Thin Client and follow the instructions shown.
Whilst I managed to get the WS7P OS installed on the onboard mSATA SSD it wouldn't boot. (See below).
Checking on the Fujitsu support site it looked like the only BIOS updates I found were all rolled up into a WinFlash Application that ran within Windows. (Wrong! see below). Rather than seeing if I could unpick things I decided to download and install the latest version of WS7P on the mSATA SSD. (The SSD was blank having been wiped by the vendor of my S720).
I downloaded the WS7P Recovery USB Flash Medium, unzipped the file and used StickWizz to create a bootable USB pen drive. I moved this over to the S720, booted it, and it copied over the Windows System to the S720's 16GB mSATA SSD. When I tried to boot this I ended up with a just a flashing cursor in the top-left of the screen. After a few minutes of poking around I gave up and moved on to the next option.
I had noticed that in the BIOS, under the 'Advanced' tab there was an option for 'Auto BIOS update'. I decided to try this out and set the options on the screen:
Terms of Use [Accept]
Automatic BIOS update [Daily]
Update Server address webdownloads.ts.fujitsu
.com
Silent update [Disabled]
Manually check for update [Disabled]
Having done that I rebooted. The BIOS paused for while as it rebooted but then moved as normal. I don't know exactly what you have to do to get this to work (or whether it still does).
It was at this point I discovered that the 45MB download file on Fujitsu's support site labelled BIOS Update - Admin Pack for D3313-B1x actually held a variety of options for updating the BIOS. I used rufus to format a USB flash drive with FreeDOS, downloaded the 'Admin' file and unzipped its contents to the flash drive. I moved the USB flash drive across to the S720, booted it, changed to the DOS directory and ran DosFlash.bat. That worked. I shouldn't have let the 'Admin' in the file name put me off looking at it sooner.
If your S720 has the BIOS Administrator password set you can clear it easily. The procedure is:
Originally I suggested you move the shorting link to the left hand end of the header. This also works but in this case there is a very long delay - maybe thirty seconds or so - before anything appears on the screen after which you can power down and move the link back to its default position.
My guess is that moving to the right is just a straightforward 'clear the password' command. Moving it to the left, as well as clearing the password, invokes a BIOS Recovery routine where it expects to find a USB drive containing the recovery software and BIOS. In that case it spends some time waiting/looking for the USB drive before eventually giving up and booting normally.
My thanks to Alberto for pointing out that moving the link to the right was the correct way to go.