I have a 2-Channel Vibration Sensor Plus (PR55-61N) that I recently purchased and had some issues with. I initially connected it to an Ethernet Modem and transmitted the data to Node-RED. The sensor would send the right object when the RST button was pressed, but not automatically after a set interval as it should. I tried to enter the config mode using the button sequences listed inside the manual but had no luck. After many troubleshooting steps, I attempted to factory reset the device. When doing this the sensor will not transmit anything to any modem (USB or Ethernet). Pressing the RST button provides a faint LED but does not transmit the data to Node-RED or Alpha station even if the ‘unknown sources’ box is checked. I have tried to load new firmware (multiple versions) on the device using a USB-to-UART converter, but that did not work either, perhaps I did that incorrectly. I have referenced this post and others to get this far but it seems like I am stuck.