Update steps:

1, Quartus download link  https://www.altera.com/downloads/download-center.html, select download the 12.1 Web Edition and install in your computer.
　

2, Connect the USB update port of the DI-20 , the Windows request the driver install, select the driver to install

Driver: C \ altera \ 12.1 \ quartus \ drivers
 

3, Power on the DI-20, open the Quartus 12.1 software , and select “Perform automatic web license retrieval “ then click “OK”. During update, you must keep your computer had the good web connect .

4, Click the iron as below (Pic1) .
　

5, Follow the steps select as below (pic 2) .

6, Follow the steps select as below (pic 3) .
　

7, Follow the steps select as below (pic 4), click “Start “ and waiting one minute while the “Program” show “Succeed” .

8, Power off the DI-20, pull off the USB cable from the DI-20 update port, then pull off the connect from the computer. The update is finished.