Pixhawk can't start ESCs calibration

Hi!I have started my first custom drone setup and stuck on ESCs calibration.I am using Pixhawk 2.4.8, my RCS is RadioLink AT9S, R9DS receiver is connected to flight controller via SBus, ESCs are Turnigy MultiStar 30A BLHeli-S Rev16 V3. I upgraded Pixhawk's firmware with QGroundControl, then I binded AT9S, calibrated Pixhawk's sensors (accels, gyros, etc.) and radio in QGroundControl.I tried to calibrate ESCs according to official guide. I turned on my transmitter and put the throttle stick to maximum. I connected my 4S LiPo battery and heared three beeps (apparently from motors), then sound from buzzer "Start up OK" (ardupilot.org/copter/docs/common-sounds-pixhawkpx4.html), then two beeps with rising tone (from motor). Pixhawk's LED became flashing blue (instead of red, green, blue flashing). So board didn't switched into calibration mode. In tutorial (http://ardupilot.org/copter/docs/esc-calibration.html) it is noted that some brands of ESC do not allow calibration and will not arm unless you adjust your radio’s throttle end-points so that the minimum throttle is around 1000 PWM and maximum is around 2000. In QGroundControll PWM_MIN is set to 1075, PWM_MAX - to 1950. I changed these values to 800 and 1600. I changed in transmitter's settings throttle endpoints to 140% (with old values PWM_MIN 1075 and PWM_MAX 1950). After every modification I provided recalibration of the radio, but nothing changed.What could I miss? What could be the problem? Could I skip some sufficient step during the constructing process?

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