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To setup Nighthawk router, begin by connecting it to your modem using an Ethernet cable. Plug the router into a power source and turn it on. Next, download the Nighthawk app on your smartphone or visit the web interface. Follow the on-screen instructions to complete the setup process, including choosing your Wi-Fi network name and password. Ensure all devices are connected, and run a test to confirm that your internet connection is stable. For additional customization options, access the router's settings through the app or web portal.