The Axon40 PCB is a modified layout for the Neuron ortho. It's ortho but with a bottom row with larger than 1u keys.
Make example for this keyboard (after setting up your build environment):
make checkerboards/axon40:default
Enter the bootloader by shorting GND and RESET between switches 37 and 38.
See the build environment setup and the make instructions for more information. Brand new to QMK? Start with our Complete Newbs Guide.