I found a fault with powering on and initializing the Cube. I have ADS-B transponder (Aerobits TR-1W), and it works well with Cube, but only when it’s powered after Cube is initialized. When it’s powered with Cube, Cube fails to initialize (Arduplane 3.9.11 both ChibiOS/NuttX). I had similar behavior with serial modem (Microhard Pico400) - Cube fails to initialize if modem is already powered on. We fixed this with power-on sequence, but that’s really annoys.
I’m not sure whose bug it is, but if you have any ideas, that would be helpful.