We have another product that is currently being tested, a PC based update app we call "iFly GPS Updater" (name subject to change).
It works like this: 1) Put your iFly's SD card in your computer (of course, this requires an SD reader...most new computers have these built in, but you get by a USB based reader if needed). 2) Run the iFly GPS Updater. 3) The app finds everything that needs to be updated, let's you confirm, then it automatically downloads all the updates directly to the card.
This will work for both iFly 700 and 720 users, and although most folks are successfully using the 720 WiFi interface, those with compatability issues will have an excellent 2nd choice for updating their units.
Of course, the USB update procedure is always available as well.
-Walter