I got problem with Arduino MKRfox1200.
I tried example from: https://www.arduino.cc/en/Tutorial/SigFoxEventTrigger
everything worked perfectly until I added second USB for Serial1.
After that when I connect Arduino to PC I just can't see new port so I can't flash new sketch. (but Arduino works perfect even transmitting)
I tried many USB cables, I restart PC (also many times ). I even tried different OS (MacOS, Ubuntu, Windows).
But no luck.
Maybe I just burn some chip or something... if yes is there any other option how to write sketch to Arduino? (mean like through RX TX with another Arduino)
Many thanks for any advice