Here's a nice little video on how to figure this out.

For people that don't have an IG account and can't watch the video, to find the firmware: 

Look at the light pattern displayed when the pedal is powered up.  When you plug it in the presets light will light up with the first number for the firmware and the mode will light up for the second number.  For example for Firmware 2.05 on the Echosystem the preset light will light up blue on the second preset to indicate 2.0 and the mode light will light up blue on the 5th mode(filter) to indicate .06 to show you that you are on 2.05.