When I connect Duet Wifi to a PC, it looks like Bossa in Device Manager. But when I try two communicate with Duet Wifi through Bossa Programme Coming Bossa with an error message "could not connect two COM3" though Duet wifi is connected to COM3.
The LED's is illuminited red is Diag, 5v + and USB. The last LED is illuminated green is 3.3v.
I hope it can help you diagnose the problem