I tried this upgrade process on a couple of my iDevices. It requires a sign up process that fails every time. I don’t know why you need to sign up for a firmware upgrade other than maybe for marketing reasons.
EDIT: I can confirm that once you register thru their website it is possible to complete this firmware upgrade. I still don’t understand why you need to register for this upgrade or why you can’t register on the device that actually runs the upgrade app.
