Xbee S2, accidentally plug the IO0 (pin 20) and the IO4 (pin11) to VCC (3.3V) and GND.I broken my Xbee?

XBee & XBee Gateway XBee Programamble (S2C & 900 HP)
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Most likely you haven’t. But if it is drawing high amounts of current or you are not able to communicate with it, then the answer would be yes you did.