Firmware upgrade on 6445S

Hi, due a strange problem with my new controller 6445S about axes moviments after homing procedure i’d like to change the firmware on the controller because it’s the last thing that is left to do before that i send back this controller for replacement. My current firmware is 26.01.13 and also i would like to know if i can put the firmware of 6445G safely or are different ?
Thanks

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