code: def firmware_version(self):
          
          namespace = "urn:brocade.com:mgmt:brocade-firmware-ext"
  
          request_ver = ET.Element("show-firmware-version", xmlns=namespace)
  
          ver = self._callback(request_ver, handler='get')
          return ver.find('.//*{%s}os-version' % namespace).text
docs: Returns firmware version.
  
          Args:
              None
  
          Returns:
              Dictionary
  
          Raises:
              None