NOTE: The default Linksys Smart WiFi Router password is admin.
Disconnect the ethernet cable that connects your router to the modem.
Locate the Reset button of your router. Using a pen or a paper clip, press and hold the Reset button for 10 seconds.
NOTE: The location of your router's Reset button may vary depending on the model of your Linksys router. The Linksys EA7500 v3 is used in the example below.
Observe the power light on the router while pressing the button. When you see the light blink or flash, release the button. This indicates that the router is resetting properly.
Unplug the router from the power outlet for 30 seconds. Plug it back and wait for the power light to be solid.
Setting up your Linksys router with a static IP account through Linksys cloud account
Setting up your Linksys router with Cable Internet service using Linksys Smart Wi-Fi