xbee serie 2 set address problem

Hello guys ,

I recently got some new xbee shield for arduino with xbee serie 2 , when i try to config the module everything is the same and works fine but i can not change the address , in the older modules i was simply sensing ATMY*(CR) being ** the number for example ATMY0(CR) i will set the address to 0 , but now when new modules i get error and when reading the address by ATMY(CR) i get this : FFFE . how could a set the module to 0 ,or 1 Address like the older xbee modules ?

Thanks for reading :)