I have a longer b1 30 watt. It loaded up with grbl m3 and I had no idea I needed m4. I later changed to m4 and I got terrible results on my material test. See photos. I have no idea what to do and I have watched several videos and tutorials. Any help would be greatly appreciated.
Create a new Device manually and use GRBL without any added characters. I have a feeling that will work better for you.