How to Factory Data Reset (FDR) your Chromecast

From the Google Home app

1. Open the Google Home app .
2. At the upper-right corner of the home screen, tap Devices  to see your available Chromecast devices.
3. At the top-right corner of the device that you'd like to FDR, tap the device card menu  > Settings.
4. At the top-right corner, tap the More button .
5. Tap Factory reset or Reset.
6. Confirm that you would like to reset your device by tapping Reset.

From the Chromecast device

While the Chromecast is plugged in to the TV, hold down the button on the Chromecast for at least 25 seconds, or until the solid LED light begins flashing on the Chromecast device and the TV goes blank and begins the reboot sequence.

From the Google Home app

1. Open the Google Home app .
2. At the upper-right corner of the home screen, tap Devices  to see your available Chromecast devices.
3. At the top-right corner of the device that you'd like to FDR, tap the device card menu  > Settings.
4. At the top-right corner, tap the More button .
5. Tap Factory reset or Reset.
6. Confirm that you would like to reset your device by tapping Reset.

From the Chromecast device

While the Chromecast is plugged into the TV, hold down the button on the side of the Chromecast. The LED will begin blinking orange. When the LED light turns white, release the button and the Chromecast will begin the reboot sequence.