Plug the Chromecast into the TV and power source
Make sure the Chromecast is turned on
Press and hold the button on the Chromecast
Keep holding until the LED light changes color and starts blinking
Release the button when the light turns solid white or the reset process begins
Wait for the Chromecast to restart and factory reset
Open the Google Home app if you want to set it up again
Select the Chromecast and follow the setup steps