config can not be saved in C#

[DongBCB]

                        ret = xarmApiDll.XArmAPI.set_tgpio_modbus_baudrate(38400);
                        Console.WriteLine("set_tgpio_modbus_baudrate 38400: {0}", ret);
                        ret = xarmApiDll.XArmAPI.set_tgpio_modbus_timeout(1002);
                        Console.WriteLine("set_tgpio_modbus_timeout 1002: {0}", ret);

                        ret = xarmApiDll.XArmAPI.save_conf();

the save_conf can not save the changes to modbus baudrate and timeout. To change and save the settings must use Ufactory studio. Please resolve the bug, thank you.