Echo dot 3rd gen not booting up tried holding the action button for 25 seconds nothing just stuck on the long spinning cyan ring (I'll put what happened in the comments) :
Unboxing All-new Echo Dot (3rd Generation) — Smart speaker with Alexa | by Bhargav Shah | Medium
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Exploring the Harmony of Utility and Innovation: The Amazon Echo Dot (3rd Gen) with Alexa
How To Use The Action Button On Echo Dot? - AudioGrounds
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Echo Dot Reset Button, Where Is It | Tom's Tek Stop | Echo dot, Reset button, Alexa echo
What Do the Echo Dot Buttons Do?
Amazon Echo Dot (3rd Generation) Review
What Are the Buttons on Your Amazon Echo Speaker For?
Amazon's Echo Buttons can now trigger Alexa Routines - Gearbrain