Follow Sol 3 flashing instructions, but use
qmk compile -kb rgbkb/zygomorph2 -km default
You may need to trim switch pins by ~0.5mm
Primary/Secondary labels are wrong on SW4 for R1.0 boards, use the opposite!
Set slide switches (SW2,SW3,SW4) to choose left/right USB port to the PC, and determine primary/secondary handedness