@Mark-Christensen If you have Grbl 1.1 installed there's no need to change anything. The bootloader is like the BIOS on a computer, as long as it works and the firmware runs you don't care what version it is. I have some firmware that is too large to install with any firmware and most requires optiboot to fit.

If using the first method, so color is used for sequence you will probably want to set Absolute DXF Colors to 0 so every color has the same value (that is certainly the case with a laser but may not matter with a plasma).

@tobiasdahlgren87 T2Laser defaults to following the DXF order, but you can use the DXF Optimizer to define the sequence by the color.

Another way to do it is using sequential mode but that's for CNC tool changes, it will stop and ask you to change bits which of course doesn't make sense with a plasma.

@jottajotta I can only help if you use T2Laser.

The steps are simple, if needed install the CH340 driver from the Help menu and then select the COM port and connect to your machine. It should work.

@cgibson It appears to be a problem with the laser module.

@cgibson It should not matter, the device driver won't be uninstalled.

@cgibson If you use T2Laser I can help you get it working, but as I said you need to do a clean reboot of the computer as the bad Eleks software locks the port and prevents other software from connecting.

@traceyanna The manual is included, click Help / Manual or press Shift-F1. You will also find some videos to learn the basics in the Help menu and I have some quick guides for various features on my website.

@Annie Check the wiring, there's only 3 connections you need. 12VDC power and ground, and the TTL signal.

@traceyanna Are you sure the laser is connected? Do you see the Grbl Ready message?