by Max » Thu Aug 23, 2012 11:25 pm
You seemed to have implied that you can change the flow control and baud rate setting for the firmware flashing part. But I don't think there's a UI for that. So I'm wondering if you're connecting using the main QGC "Communications" menu dialog to connect before flashing? The flashing procedure uses its own COM connection (and settings, I believe), and you should be _disconnected_ via QGC/Mavlink first.
BTW mine flashed OK with just the Tx, Rx, and GND connected. And it shouldn't be necessary to change any Windows settings (that port is recreated every time you plug the USB adapter in anyway).
HTH,
-Max