Woah, thread from the dead... An answer after all this time!

~
Actually, I did connect it directly to the cable coax connection. That's what got me to the walled garden thingie with it.
I doubt TFTP would work as VM are likely to have it very locked down so as to avoid hacking. Still, perhaps R19 wasn't so locked down, didn't I read something about being able to hack in and turn on modem mode in R20?
Whatever, unless I could get hold of the R30 firmware as a download I have nothing to try with. And I can't
If anyone knows how to download the R30 firmware as a file to try to TFTP to my second Superhub, do tell.
Otherwise it's stuck with firmware R19 which has God awful wifi on it. Way worse than any other release (and I've tried them all except the betas). It is basically unusable as a wireless unit as it is.