Fox Alien Reiser 20 Watt Laser 400x400 work area

works great with Laser GRBL but when I try to use \ lightburn I get the message "invalid G code ID:66 I have tried changing the USB cable, also starting the laser before starting lightburn, to no avail. laser head refuses to move using either homing or jogging and will not run a burn file, what am I doing wrong?

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