Well when I first tried the upgrade the website couldn't find my cable modem, when I disconnected the router and connected the modem directly the cable modem was found and the upgrade went through

Actually thinking about it, the router is after the modem anyway so I dont know why it didnt work first time round

Perhaps the upgrade page needs to see the computer too, which it wouldnt do because of the NAT on the router (I think) - hehe.
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