I have a ZADSR32xPROXR board and i get either no light for RX on the USB module and can’t get communication with the PC or sometimes there is an inconsistent flash. If I swap the relay board with another everything works fine. I think the board in question has a fault. Is there a way to test?
The best testing tool is Base Station (ncd.io/start). It should automatically discover the correct Serial Port and will search through baud rates.
If Base Station doesn’t find it you can check that the USB module is seated properly in the socket with no pins overhanging anywhere. You can try a new USB cable.
Can you send a picture of the board powered up?