public void removeFirmwareUpdateCallback(OneSheeldFirmwareUpdateCallback firmwareUpdateCallback){
  if (firmwareUpdateCallback != null && firmwareUpdateCallbacks.contains(firmwareUpdateCallback))   firmwareUpdateCallbacks.remove(firmwareUpdateCallback);
}

public void removeFirmwareUpdateCallback ( OneSheeldFirmwareUpdateCallback firmwareUpdateCallback ) { if ( firmwareUpdateCallback != null && firmwareUpdateCallbacks . contains ( firmwareUpdateCallback ) ) firmwareUpdateCallbacks . remove ( firmwareUpdateCallback ) ; }
remove a firmware update callback .
