code: def config_mode(self, config_command="sudo su"):
          
          delay_factor = self.select_delay_factor(delay_factor=1)
          output = ""
          if not self.check_config_mode():
              output += self.send_command_timing(
                  config_command, strip_prompt=False, strip_command=False
              )
              if "Password:" in output:
                  output = self.write_channel(self.normalize_cmd(self.secret))
              self.set_prompt(prompt_terminator="#")
              time.sleep(1 * delay_factor)
              self.set_base_prompt()
              if not self.check_config_mode():
                  raise ValueError("Failed to configuration mode")
          return output
docs: Attempt to become root.