code: def save_config_variables(self):
          
          command = 0x43
          byte_list = [0x3F, 0x3C, 0x3F, 0x3C, 0x43]
          success = [0xF3, 0x43, 0x3F, 0x3C, 0x3F, 0x3C]
          resp = []
  
          # Send the command byte and then wait for 10 ms
          r = self.cnxn.xfer([command])[0]
          sleep(10e-3)
  
          # append the response of the command byte to the List
          resp.append(r)
  
          # Send the rest of the config bytes
          for each in byte_list:
              r = self.cnxn.xfer([each])[0]
              resp.append(r)
  
          sleep(0.1)
  
          return True if resp == success else False
docs: Save the configuration variables in non-volatile memory. This method
          should be used in conjuction with *write_config_variables*.
  
          :rtype: boolean
  
          :Example:
  
          >>> alpha.save_config_variables()
          True