Further to this I don't think I've had much luck with changing the firmware.
If I download the firmware from here: https://www.2manuals.com/product_info.php?cPath=107&products_id=1851
And try to install with the printer turned on and in a normal state then it takes a long time to update, gets to 99% and then fails. If I check with wicreset the firmware version has not changed.
If I try to install with the printer in the 'firmware update' mode (by holding down the four buttons) then the firmware update happens much faster, says that it completed and the power light on the printer starts flashing. If I turn the printer off at that point and turn it back on again it starts OK but when I check the firmware version with wicreset the version has not changed.
Any tips? Even when I eventually do get my license key at this point I'm not sure if it will even work if the firmware version on the printer never seems to change (currently FA20I4 20/04/2018)