I’ve got a MacBook pro and couldn’t communicate with my Ruida over USB or ethernet. Read everything I could find, tried everything (including 3 different USB cables), nothing worked. Ready to try a USB thumbdrive, and found my Mac couldn’t recognize my thumbdrives… aha!
It was a problem with my Mac. Did a reset by holding down the power button for 5 seconds. When it restarted it could read my thumb drives and LightBurn could communicate with laser no problem. I’m in business.
Posting this in case it’s helpful to someone.