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You'll need a phone, tablet, or laptop computer to set up Chromecast. You can set up Chromecast by first navigating to cast.google.com/chromecast/setup. Tell us a little more about where you're having trouble:
Please note: You may need to change your router settings before Chromecast can communicate with your network. Please refer to the Chromecast router compatibility page for more information.
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Please note: Guest mode can be set up (or turned on) on any device that supports the Google Home app. Guest mode can be used for casting as a guest on Android 4.3+ or iOS8 devices.
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Which error message do you see displayed?
I have a question that doesn't fall into the above categories: