OK.
I dont know if I understand the problem correctly, but is the software working with your unit (at least one time)?

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Spirit System developer

I found the problem.
My receiver feeds the spirit with power via the aux input or rudd.
In the receiver, the motor controller is plugged in.
If I go directly to aux now I have a connection.
Apparently my receiver provides the fbl system with too little power.

Thank you for your help

Great, for me it seems as some of these cables was reversed in polarity. I mean connector was flipped.
Receiver cables should handle it without any issue, but something was connected wrong.
It could be dangerous is some cable was reversed.

If you are able you can take a photo of the previous connection.

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Spirit System developer

The polarity was correct everywhere.
I have connected everything according to instructions of the spirit.
The thro cable but I have plugged in the receiver (motor controller).
That is, the power supply runs through the receiver in the spirit.
On spirit is but too little. the red LED light is poor.
When I connect the power supply directly to the spirit, then flash the led and my servos move also.
Because after I get a USB connection.

That means I need another receiver with separate power output.

One more question: For the rescue function I need a 7 channel?
Is that correct?

It is still very strange, it should work with your receiver too. It should be enough if you connect receiver and unit with AUX or RUD cable. If you use both cables to AUX and RUD, it can transfer even 20A continuously which is normally enough for all available servos.

What is your receiver?

You do not need 7th channel. You can activate Rescue with Gyro channel with any 6CH transmitter/receiver.

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Spirit System developer

A Graupner GR-12L Hott. 6 channel.
No idea why. The receiver works perfectly.