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Reset Chromecast Factory data reset

Method 1: Use the button on Chromecast to reset Chromecast

Hold down the button (next to the micro USB port) on your Chromecast for at least 25 seconds or until the solid light begins flashing. Then disconnect the USB power cable. Wait a few seconds. Connect the USB cable again. This will factory reset Chromecast (factory data reset).

Because there is only one button on Chromecast, you surely will not miss it.
Method 2:  Using Chromecast App in your devices to reset Chromecast

This method is only applicable when you still can connect to Chromecast from your device (e.g., an Android phone or tablet).

Sometimes, if Chromecast simply freezes and you cannot connect to it from your device, you then have to use method 1 mentioned above to reset Chromecast.

To reset Chromecast, you need start the Chromecast App on your device, find and connect to it. Once connected, tap the menu button, you will see the information on this Chromecast dongle, and a popup window