Arduino ADK - DemoKit,Android phone does not recognize Arduino(or viceversa?)

Hi,

I am using the Arduino Mega ADK and i've been trying to connect it to my Galaxy S4 gti9500 so I managed to install the firmware as specified in Android's Accessory Development Kit 2011 Guide "http://developer.android.com/tools/adk/adk.html", however when i Launch the demokit.apk on my phone and try to connect it to the Arduino Board nothing happens? I don't know if it is my phone version, the .apk, or i just installed the firmware wrong... though it compiles just fine...

Any help is really appreaciated.

Thank You,

Alejandro GarcĂ­a