ecobee devices will update themselves automatically, provided they are connected to Wi-Fi. When a firmware version is ready for the public, it will be pushed out gradually over a period of time to all applicable ecobee devices.
You can find the firmware version of your ecobee thermostat by going to MAIN MENU > ABOUT, through the thermostat interface.
Auto-Upgrade Firmware Versions as of July 12th, 2021 :
|SmartThermostat with Voice Control
| ecobee3 lite
| Smart Si
| EMS Si
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