Have you restarted the modem? Have you checked the modem configuration? The upgrade involves a new configuration file being sent to your modem, so you want to make sure that's been received and the modem subsequently restarted.
root and root afaik for the models that do require a login (mine doesn't so not sure exactly).i get asked for a username and password
i havent set one, so whats the default the modems use
root and root afaik for the models that do require a login (mine doesn't so not sure exactly).