About everything except the main firmware can be downloaded and uploaded through the network.
Polar Edit has a menu for ftp settings. Enter the box IP and root for a username to set the system up for file transfers.
SetEditFDU also has a network setting and the same information would be used in it. Channel files may be loaded into SetEdit from the receiver to the computer over the network without issues, but the box will need to be hard reset using the rocker switch on the back when you transfer a file from SetEdit to the receiver.