Setting up and reverting jtec and inventables hex

[picengravertoo]

Try this inventables grbl 9j hex download.

Dark Lines JTech 3.8W Laser Upgrade (LaserEtch)

Are you using the grbl 9J hex at the top of the Master Branch list on this web page? GitHub - inventables/grbl: Inventables X-Carve specific Grbl versions: I just tested it here and it connects fine. Do a right click on this page and save as somewhere on your PC then remove the .txt extension and try it. https://raw.githubusercontent.com/grbl/grbl-builds/master/builds/grbl_v0_9j_atmega328p_16mhz_115200.hex