Changing BAUD rate UART

Just a quick confirmation.

I want to connect my TBS crossfire to the Navio 2 UART to send and receive Telemetry.

Is the UART Serial 0 or 1

It can be serial0 or serial1 depending on how you configure the ardupilot startup command.
-A /dev/ttyAMA0 would be serial0
-C /dev/ttyAMA0 would be serial1

You can find mapping between switches and serial ports in our docs. So you can choose UART port using ArduPilot’s startup command.

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