Ask Mike - Report #3
"II. How to determine your software version.
* Press and immediately release the Control Knob to display software version. The software-version number is four digits that display one digit at a time in the Bogey Counter-example: 2.869.
* Note your software number, then see the table below for features that are programmable in your unit.
* Press and immediately release the Control Knob to exit software-version display. "