The current firmware version is 3.2.20160930.1.
NOTE: Embers that are currently running firmware version 2.x, updating to v.3 requires a special procedure, which is described in this article. If you install firmware v. 3.x without following up proper upgrade procedure, your Ember will become non-operational.
To determine which firmware version is installed on your Ember, when Ember is in "Ready to print" mode, press and hold the left button for 5 seconds. When you release the button, the firmware version number will display.