thanks nootropic,
i agree with you, but i have one doubt,since i m using XBEE24-AWI-001(series-1) having firmware version=10E6.
Both module having same version, how can i decide firmware for coordinator and router/end device.
XCTU update all versions ,it goes up to xbeepro.
when i m updating firmware ,should i connect xbee modem to usb.
please guide me.