After about 5 seconds in, your Google Mini will begin to reset. Still hold the button until you hear a confirmation beep that the factory reset is done! To tell if you have the Gen 1 or Gen 2 Mini, flip it over. If you don’t see anything, then you have a Gen 1 Google Home Mini. You cannot use the mobile app to factory reset your Google Home Mini. If you just need to reboot the speaker without resetting it to factory settings, unplug it from a power source for about one minute. After that minute has passed, plug it back in. To reboot, you can also use the Google Home app on your phone by going to Settings > Device Settings > More > Reboot".
The lights on the top of the speaker will flash orange to indicate the microphone is off. To tell if you have the Gen 1 Mini or the Gen 2 Mini, flip it over. If you see a wall-mount screw slot, then you have a 2nd Gen Mini, also called the Google Nest Mini.
You should hear a warning that you’re about to wipe the device. Continue holding your finger down on top of the speaker to progress the factory reset. After 10 more seconds, you’ll hear the confirmation beep that your Google Nest Mini reset and can stop pressing the top of it. [1] X Research source
