This post only concerns users that help us in testing the multiplexers and have the 1st hardware prototype. In that hardware, the internal pads that support the input PX serial port do not exist and (THIS IS THE PROBLEM) the Can Bus pins used by the ESP32 are different from the final hardware. In order for those users to continue to use the prototype hardware with future improved firmwares, we will publish 2 BIN files whenever we update the firmware. One file has an appended X in its name as shown in the picture.
That X means that the BIN uses the Can Bus pins of the 1st prototype. So the user only has to change the normal URL for the download by appending that X in the filename. Here are the 2 links that I am referring to for the case of the initial release: