Well, since you've flashed it with the xtreamer firmware perhaps the trick to get telnet outlined in this link will help (I'd guess you should use a usb stick OR hook it up to your desktop by usb cable and drag the files over):
http://forum.xtreamer.net/viewtopic.php?f=38&t=4914
h t t p://forum.xtreamer.net/viewtopic.php?f=38&t=4914
Of course, it would be just your luck that even web access is limited by some deeper gui menu option.... that you can't get to without a working remote setup. Or telnet.
Anyway, give it a shot while you wait on that cable.
-wigout