The drone disarms itself immediately after arming.
Raise the throttle stick slightly, if you don’t apply any throttle it will disarm again.
In Mission Planner: Go to the Config/Tuning tab.Select Full Parameter List. Find DISARM_DELAY(or related param) in the list.
Change the DISARM_DELAY value:The DISARM_DELAY parameter specifies the delay in seconds before the drone disarms itself after arming. Set it to a higher value to increase the disarm delay.
For example, setting it to 10 will make the drone wait 10 seconds before disarming automatically.
I did it but it didn’t work
Are you sure your throttle channel is correctly assigned? If you go to radio calibration in Mission Planner and move the sticks are the bars moving accordingly?