This is downloadable zip file containing the development firmware files for the CNC xPRO V5. This firmware is licensed under:
GNU General Public License v3.0 (copy provided in zip file for those unfamiliar).
The CNC xPRO V5 firmware is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. The CNC xPRO V5 firmware is a port of the GRBL ESP32 firmware, which itself is a port of the original GRBL firmware.