With the CTS and RTS pins disconnected the BRD_SER1_RTSCTS (with use Telem1) or BRD_SER2_RTSCTS (with useing Telem2) should be set down to zero (after making the change the flight controller will need to be restarted).
With the CTS and RTS pins disconnected the BRD_SER1_RTSCTS (if using Telem1) or BRD_SER2_RTSCTS (if using Telem2) should be set to zero (after making the change the flight controller will need to be restarted).