Autotune falied. flight log (.bin) attached

i want to autotune my hexarotor with pixhawk 6c. when copter tries too tune it says autotune failed . tune it manually. what is happening?

https://filebin.net/uo5bzqwbkywcs929/10%201-1-1970%203-30-00%20AM.bin

You are on default parameters, that’s what’s happening. You didn’t even set the Initial Tune Parameters which are pre-1st flight.
Resources for you to follow:
Tuning Instructions
Methodic Configurator

this is not my first time. i have tried to auto tune with this steps in the docs. preparing the copter just the way in the instructions. but the same result has happened.
for more, the copter is F550 hexacopter with 1045 blades and 2216 920kv motors and air 20A ESCs.

@MH_JMC It is not the first time that you try autotune without doing the mandatory initial tune?

You can do that 1000 times, the results will not change unless you correctly do the initial mandatory tune, followed by notch filter and so on.

If ap is set on a damper, a pad with damping plastics, does the damper affect the autotune?

I do the instructions one more time and give you the data.

What effects Auto Tune is not preparing the craft for Auto Tune.

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I ask you one more time: read the tunning instructions and/or use the ArduPilot methodic configurator software.

Doing Autotune without first following the mandatory configuration will NOT work.

Are you sure you have an Autotune problem, or other hardware issue is causing the problem?

Yes. That topic you sent here is another autopilot and different copter. Not the same

I am curious, how many drone do you have? You mention all are Pixhawk 6C in the posts. you seem to have multiple issues.

I wonder are you diagnosing multiple issues on multiple drones?

I would concentrate on one and copy and paste to the rest of the same type and class.