RS485 PAR Sensor Stops Responding

Our recent modifications to the RS485 Photosynthetically Active Radiation (PAR) Sensor (400-700nm) resulted in an unfortunate mistake. Rather than changing register 2000, we accidentally changed 2001, which appears to be connected to the baud rate. The original value of 1 was changed to 7.
After then, as anticipated, communication broke down, and despite several attempts, nothing worked.
Has anyone thought of a way to get the gadget back? Another alternative or hidden way to reset the factory?