iOS does not show the icon because the wifi network is not connected to the Internet. For reasons known only to the good people at Apple, they do not show the signal strength indicator for “local only” networks like the FlightBox sets up.
To check just go to IPad settings and select Wifi you will see your Internet and you will see Flightbox and if lucky see half the neighbourhood wifi as well lol.
Firmware update worked just fine using Windows Ten laptop. QED.