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Connect Pixhawk with Raspberry via USB TTL

I have connect a Pixhawk with Raspberry via a USB to Serial. But when I have done, I have this error. Please help me to fix it.

What model of Raspberry Pi are you using?

If you want to use the UART GPIO on Pi 3 or above, you will need to disable the Bluetooth on it.

Nope, I use USB TTL.

Servers by jDrones