From Firmware Version 1.3 onwards, you are able to check which firmware version is running on your Komplex Sequencer. To check, hold down the button for the Active Step in the Section Controls while pressing the button for Gate in the Section Controls.
On all four sequencers you will get visual feedback of which firmware is installed. The steadily lit Step Select Buttons represent the CV/Gate Firmware update version before the dot (f.e. when the first step is lit, it means 1.X), while the flashing lights represent the version behind the dot (f.e. when the third button is flashing, its Version 1.3).