You can check the firmware on your ecobee by going into MAIN MENU > ABOUT > VERSION on your thermostat.
If your version differs from what’s listed below, email our Support team at
firstname.lastname@example.org with your 12-digit ecobee serial number (found under MAIN MENU > ABOUT) to request an upgrade.
Most recent versions as of June 2018:
ecobee3 lite: 126.96.36.1992
Smart Si: 188.8.131.52