For a proportion of users, we've discovered that firmware updates will sometimes take a few attempts before succeeding.
If you find that nothing happens when you perform the firmware update, then please perform the following steps to try the update again:
reset the ICON by connecting it to a powered USB for 10-15 seconds
swipe the app out of phone memory and restart
In particular the upgrade from v27 to v56 can be problematic.This is due to a change in the underlying architecture which causes the light to reject firmware updates if they are not performed within a very tight duty cycle.
It is not possible to cause harm to the lights while performing a firmware update. If the update fails for any reason, the lights will reset back to the old firmware after a few minutes, or as soon as a powered USB connector is connected.