This is the correct manner in which to force an immediate update of the firmware.
Follow this procedure exactly:
(1) Register Echo Dot normally in the app and complete the setup fully;
(2) With Echo Dot still powered on, DEREGISTER the Echo Dot in the app;
(3) UNPLUG Echo Dot from wall power for 10-20 secs;
(4) PLUG Echo Dot back into power and <<<<< DO NOT TOUCH ANYTHING ON THE ECHO DOT >>>>>
(5) Echo Dot will power up with a blue ring and the green short bar will circle, THEN it begin to download update (blue ring with half green bar circling)
(6) Once update is complete blue ring will turn red and reboot and Echo Dot will state it is not setup and to follow the procedures outlined in the app;
(7) Press and hold the action button (button with white dot) until ring turns orange and Echo Dot will state it ready to setup;
(
Go back to phone and connect to Echo Dot in wifi mode;
(9) Go back into Alexa App and complete the setup process again;
(10) Once you complete the process you will see the Echo Dot adopted with all the previous settings from before WITH the most recent firmware.