Perform a soft, factory, and alternate master reset of the device.
INSTRUCTIONS & INFO
POWER CYCLE YOUR DEVICE: Press and hold the Power button located on the top of the device. To turn the device back on, press and hold the Power button until the screen lights up.
RESET YOUR DEVICE: From your device's web browser, go to http://attwifimanager. Enter your Username and Password, then click SIGN IN. Note: Ensure that your device is connected to the Netgear Nighthawk's Wi-Fi network. For more information, please see the Connect Devices to Wi-Fi or Connect PC or Mac to Wi-Fi tutorials.
Click SETTINGS at the top of the page.
Click Administration, then click Factory Reset.
Click RESET DEFAULTS.
Click Yes to to begin the reset process.
PERFORM AN ALTERNATE RESET: With the device face down, use your thumbs to apply pressure to the Remove icons on the back of the device then slide up to remove the back cover.
Insert a SIM tool or paperclip into the RESET button below the battery for 10 seconds.