In case of critical malfunctioning of the DRC MP CAN or incorrect communication with the processor, it is possible to recover it by entering the "Recovery" mode.
To run recovery mode follow these steps:
1. Turn off the processor
2. Disconnect the DRC AC cable from the processor.
3. Turn on the processor
4. Press the DRC AC knob, keep pressed the knob and reconnect the DRC MP CAN to the processor, wait for the central LED to become white colored, release the pressure of the knob.
5. Repeat the firmware upgrade procedure as described in paragraph 7. DRC MP CAN FIRMWARE UPDATE