Hmm…I don’t remember seeing that problem. Can you get a serial terminal to work using Serial.begin(115200); and Serial.println(“some stuff”); in Arduino? You’re also welcome to try my code here (https://github.com/ShawnHymel/ei-keyword-spotting/blob/master/embedded-demos/arduino/wio-terminal/wio-terminal.ino) that’s been modified from the Edge Impulse example (note that you’ll need to have an Edge Impulse library installed…I used a keyword spotting model for that particular program).