Metal Plus and G2 board

[trathier]

I purchased the G2 upgrade board at the beginning of May along with the 4-start z lead screws, gear head extruder, fan upgrade, LED bar, and Ubis 13s hot end. When everything is installed all I can get it to do is light the LEDs. I am trying to flash the firmware with a 2017 Mac pro with touchbar, but the mac won't recognize the connected printer. This would go much easier with a windows solution but I haven't found one.

Ideas?