unable to communicate with Xbee serie 2 after baud rate change


I’ve try to change the baud rate of an xbee serie 2 with AT command BD but i did not receive OK after ATWR. Now i can’t communicate with the xbee with the original baud rate or the new one.
I’m using an arduino without the controller to talk to the xbee.

What can i do to reset to the factory default ?

Reflash the firmware on the module. 9600 is the default baud rate.