Make sure that VCP (Virtual COM Port) is disabled for the USB Serial Converter B. When it is enabled,
Windows configures the second channel on FTDI as a serial port (second channel is used for JTAG). This
prevents firmware from starting after the board is connected to USB. Follow the instructions below and
be sure to reboot. The change takes effect only after a reboot.
For more complete information about compiler optimizations, see our Optimization Notice.