Alexa won’t connect to other devices
Firstly, make sure your device is actually compatible with the Echo. It may need a bridge like the SmartThings or Wink hub.
Kindle Fire stuck on logo
Plug your tablet into a charger and let it charge for at least 15 minutes. Now, keep it plugged in, and press and hold the Power button until it restarts and see if it works normally. You may need to hold it down for 40 seconds or more.
Alexa Dot Setup | www Kindle Com Support | Support For Amazon Echo