1200 baud rate not working

ArduCopter Copter 4.0
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1

Hi! Im trying to work with telemetry on 1200 baud rate … and its not working and not even connected to MP
But 2400 works fine

Any suggestions?

2

Hi! Still stuck with it

3

I suggest updating to Arducopter 4.6.0-beta6 and re-testing