xbee pro x-ctu range test

i have two xbee pro 60mW chip antenna modules, an xbee explorer regulated and an xbee usb explorer, i am using x-ctu to try to make the two modules communicate with one another, at first it would not recognize the firmware version (10E6) so i just wrote in the 10CD version for XBP24, but now i cannot get the range test to work: (Error: Timeout waiting for data)

what can i do to fix this error?

thanks

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