Echo dot V4 - echohacking/wiki GitHub Wiki

Similarly to V3, pressing the volume down and circle/prompt button on boot appears to put the device in a different mode. The device appears to be unresponsive (voice commands don't work, buttons don't do anything), when doing this and just holds a solid 'dark' blue light on the ring, the button to turn off voice detection still glows red when pressed, but the ring light always maintains the blue color

This is the behavior with an Echo Dot 4th Generation (With clock)