The Quark² PCB is a hotswap version of the Quark PCB. Just like the OG, it has a modified layout than a traditonal 4x12 ortholinear keyboard.
Make example for this keyboard (after setting up your build environment):
make checkerboards:quark_squared:default
See the build environment setup and the make instructions for more information. Brand new to QMK? Start with our Complete Newbs Guide.