[PA3040]

Dera All
Have a nice day
I am using
Emax 2306 2750kv
EMAX BLHELI_S Bullet Series 35A 3-6S ESC
250 frame
CC3D Evo FC
Flysky FS i6b
4S Battery

The main issue is even tiny move of throttle stick the motor speed is very high
PMW TX
I selected PWM at the input signal configuration and Rapid ESC are selected
At the out put I set 1020us for motor speed

Please advice

[TheOtherCliff]

You need to test with props off.  Test each motor with Output -> LiveTesting and move the slider to see if it can control from very slow to very fast.

If it can't control motors slow to fast with the sliders then do this:
https://librepilot.atlassian.net/wiki/spaces/LPDOC/pages/12058743/ESC+Calibration

[PA3040]

HI thanks for the advice

Yes at the motor test the motor can be controled very smoothly as well as low to high
I changed the flight mode from
Attitude  Attitude  Attitude Manual
to
Rate Rate Rate Manual

Now it has some improvement. Drone also can control little smoothly 

Is it possible to happen drone in uncontrolled behavior on Attitude mode

I when through the ESC calibration as per your point our and that is the best Method which is calibrated all the motors at one  beep.

Can We able to calibrate the motors end of the configuration and save without effecting previous  other setting  saved

please advice

[TheOtherCliff]

ESC calibration is stored in the ESC

Motor Min, Neutral, and Max is stored in the FC.

Neither of these affects other settings.

FC must be mounted top side up and with arrow pointing forward.  This means that the 6x3 servo connector pins point upward and are on the right hand side of the board.  Would you say that you see "instant flip" as soon as you give throttle?
https://forum.librepilot.org/index.php?topic=4408.0

Be aware that two wrongs do not make a right.  Motors MUST spin in the correct direction and correct props must be mounted in correct places.  Just using the wrong prop because your motor direction is wrong will fail.