Initial mode to Auto undesired

Hi everyone,

we have set in initial mode to Loiter mode, but, suddenly, after each boot the system starts at auto mode.

any cause of this?

Write the parameter again. It was not correctly set

What transmitter and receiver do you have?

If you power up with the transmitter already on, then it is putting the FC into Auto mode, and you need to set up switch warnings or something similar.

If you power up with the transmitter off, then you probably bound to the receiver while the Auto switch was set - when there is no signal (failsafe mode) old fashioned receivers output channels exactly how those channels where during the binding process.
You might be able to set “no pulses” for your receiver failsafe, or rebind with all the channels in a suitable position.
Better yet, get a modern transmitter and receiver that allows switch warning and receiver with multiple failsafe options and uses SBUS.

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