"I try connecting diode between ESC/BEC and APM to drop the voltage down from 5.15V to 4.85V and Xbee works!
But is this normally happening to other people?
Will there be any consequences to other system on the board?"
Weird problem again.XBee works fine both receiving and transmitting with power from USB-> APM -> XBEE and5V Battery-> Receiver -> APM-> XBEE But when using with ESC or BEC it only works transmitting data from APM to my PC.But not the other way…