The process to calibrate esc:
Set your receiver to PWM mode.
Power your RX with a BEC and separate battery.
Connect a servo to channel 3 to ensure that you’ve got the throttle channel.
Unplug servo and connect first esc.
Move stick to full throttle.
Power up quadcopter (and thus esc). Typically you’ll get a single beep from esc.
Lower throttle on transmitter. The esc should now beep twice, and then play a little tune.
Unpower quad.
Repeat for other escs.
If you dont have a separate bec, use one esc to power transmitter (on ch6 for example) while you calibrate the others.
make sense?