Have ATT modem with built in router, when I put in the key code and save it, it won't save. I'm new to this so not sure if it's just ATT or am I not doing something right. WiFi is on but not connecting. I've rebooted portals, system, checked TV settings. NOTHING will work, PLEASE HELP!!!!!! The WiFi is connected to my phone with the same key code so I know the password is correct also.