Hi Raymond,
yes - the telemetry goes via CAN bus through the FC but changing parameters etc. reqires a serial connection, e.g. via USB.
The layout of the PCB is pretty "final" though you can´t really say that for prototypes in general.
But testing is making good progress and so far no hardware related flaws *fingers crossed*.
Atm we have to deal with problems we didn´t cause: STM isn´t able or willing to provide a certified native USB driver for their chips.
But since we worked around the same flaw on the M4 I´m confident we´ll have it ready for the launch...
Norbert