Thanks for this note dongliang28 ! You provided the solution!
I just got an Asus Transformer Prime and went through the Android SDK installation process, installed the Unity Remote app on the tablet, and launched the Unity Editor and the AngryBots demo set in Android build mode - and nothing would happen.
I went through the steps you linked to on the addictivetips site, and now it works perfect!
I am not sure what you mean by your line “remember change the VID_xxxx and PID_xxxx to your device’s ID or it won’t work”, because I did not do that - I only followed the steps just at they are on the web site - pasted in the text as it said and updated the driver and it works!