The video on the flash drive does not show pushing the button at all. But I did do that and eventually got it working with lightburn. The real problem is their firmware loader software is garbage and binds to the first com port it sees. In my case it was com 1 but the engraver was on com 3. Had to disable com 1 then reload the firmware app. Then it worked. Thanks for the response.
To be clear I have the L3 that just launched which is a smaller model than yours. It has autofocus, no knobs, but that doesn’t work either.