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Then enter the Setup Routine of it and disable the WiFi and change the User Name if Possible and most defiantly the Password from the Default.

Then reset every computer type device that is used to connect through this Modem to Factory Defaults by using the Recovery Media that came with them and making sure that you format the HDD's in them.

That is the starting point and just disabling the WiFi and Changing the Routers Password will be the best way to start here though that is only a start.

Col