code: def download(self, protocol, host, user, password,
                   file_name, rbridge='all'):
          
          urn = "{urn:brocade.com:mgmt:brocade-firmware}"
          request_fwdl = self.get_firmware_download_request(protocol, host,
                                                            user, password,
                                                            file_name, rbridge)
          response = self._callback(request_fwdl, 'get')
          fwdl_result = None
          for item in response.findall('%scluster-output' % urn):
              fwdl_result = item.find('%sfwdl-msg' % urn).text
          if not fwdl_result:
              fwdl_result = response.find('%sfwdl-cmd-msg' % urn).text
          return fwdl_result
docs: Download firmware to device