Yea I found that funny that DLink states don't upgrade over the air with this phone yet it does not state how to do it otherwise. Must be a BIG secert that is going to someone's grave since support for this device is unremarkable. I have one of these phone too about 8 months and hardly use it.
i think they meant to have the computer with the file, be connected to the routers ethernet, not by wireless to it.
the phone has no choice, but, to be wireless :-)
also, use IE6 or higher, and turn off privacy from your firewall if you use one.