You can check the firmware on your ecobee by going into MAIN MENU > ABOUT > VERSION on the thermostat.
If your version differs from what’s listed below, email our Support team at
email@example.com with your 12-digit ecobee serial number (found under MAIN MENU > ABOUT) to request an upgrade.
Most recent versions as of March 2018:
ecobee3 lite: 184.108.40.2061
Smart Si: 220.127.116.11