Hi Rick. Thank you for your feedback .
LB found my laser at startup, i can set the dimension, the auto-home origine but in the console it’s stuck a “waiting for connection”. The laser worked with Neje software but i can’t connect the laser to lightburn.
Install the driver USB-SERIAL CH340 : done
switch the firmware to grbl1.1f with neje uploader software : done (what baud rate to use is not mentionned)
start LB and setup the laser : done
communicate with the laser : stuck