hi @CauTran ,
I'm also using OpenSDA with a JLink firmware:

You should see when the application is written that the JLINK is running. Also you should first restart the board(press the reset button) and then press the OK button on the Successfull Download message box from Simulink:

I've run also your project on my side and it runs ok.
Did you try to run other examples from the toolbox, gpio or serial, to check that the entire flow, including download on the board, is working ok?
Best regards,
Alexandra