docs: def _get_firmware_update_service_resource(self):
          """Gets the firmware update service uri.
  
          :returns: firmware update service uri
          :raises: IloError, on an error from iLO.
          :raises: IloConnectionError, if not able to reach iLO.
          :raises: IloCommandNotSupportedError, for not finding the uri
          """
          manager, uri = self._get_ilo_details()
          try:
              fw_uri = manager['Oem']['Hp']['links']['UpdateService']['href']
          except KeyError:
              msg = ("Firmware Update Service resource not found.")
              raise exception.IloCommandNotSupportedError(msg)
          return fw_uri