Could this be the same problem as in:
Wherein we found the controller is trying to home the non-existent Z axis, failing, and refusing to continue.
If so, then you must recompile GRBL with Z axis homing disabled.
Could this be the same problem as in:
Wherein we found the controller is trying to home the non-existent Z axis, failing, and refusing to continue.
If so, then you must recompile GRBL with Z axis homing disabled.