Just received Wireless Gateway 3, the Arris TG1682G version. When I try to enter the admin page at 10.0.0.1 and use the default username admin and password as well, the password, it doesn't work. I get authentication failed. I tried multipe times, and did a reset of the device. To no avail. I need to get in to put my network settings back in place.
Do you have a backup battery installed?
That doesn't matter if the button is being used for 30 seconds. It would only matter with a powercycle operation by unplugging the power cord.