Hello
I am using a flight controller HK i86 for my 4+ quadcopter.
i have just started .
i went to the tx,rx programming software and set all the channel to middle position expect throttle.(flysky CT6B)
I did stick and throttle calibration.
But when i went to change all pots (row yaw and pitch )to 50 % ,the blue light blinked sometime and went off ,with continuous
beep sounds.
Also the quadcopter works if the roll pot is set to zero,But there is no stabilizing action in the quad.
Kindly help me.

Gain pots should be about 75% for a good starting point.

have you tried reversing the throttle channel ??

I have checked it with the tconfig.
that the throttle is not reversed.
The point is that ,it works only when the roll pot is minimum(zero),that too with no stabilizing option.
I will surely test it with 75% if my problem gets solved.