This can sometimes prevent the troubleshooting of the device, as well as the process of the Linksys RE6400 setup . Do not forget to follow the instructions manual for your device. If you wish to extend the Wi-Fi range, cling to 2.4GHz, opting for channels 1, 6, and 11.Optionally, you may switch the frequency band over to 5GHz, as it is less prone to interference. https://linksys-wifi.com/linksys-re6400-setup/