If your HomePod isn't working, there's a way to reboot it or reset it back to factory defaults. Here's how to reset HomePod and HomePod mini with or without an iPhone.
How to Factory Reset any Apple TV, HomePod, AirTag, AirPods, or Beats Headphones - The Mac Security Blog
How to Factory Reset HomePod Mini - MacRumors
How to Factory Reset HomePod Mini - MacRumors
How to Factory Reset Your HomePod or HomePod Mini : HelloTech How
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How to Reset a HomePod Without Your Phone- The Mac Observer
How to reset your HomePod or HomePod mini (3 ways)
How to reset your HomePod or HomePod mini (3 ways)
How to reset HomePod and HomePod mini
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How to reset HomePod and HomePod mini
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How to Reset HomePod and HomePod Mini