Hello, I purchased Udoo neo, Udoo quad, LVDS displays, etc. and booted Android Marshmallow on it. I've been trying to use Android adk on it to talk to Arduino, but the call to open accessory fails. More specifically, mUsbManager.getAccessoryList() returns null. I've tried plugging in J16 jumper and then unplugging it to reset Arduino, but didn't make a difference. The Arduino sketch that I had uploaded is the one from "Android Arduino Hello World" UDOO tutorial. In Android UI, I've enabled Android <--> Arduino communication. Jumpers J2 and J18 are in plugged-in state. Jumpers J16 and J22 are in unplugged state. Everytime, I make sure to remove the app from "recent app list", and relaunch it afresh, but doesn't make a difference. Please advise as to how I should debug the Android adk issue. Have been struggling with this for weeks now. :-( Any help would be appreciated ! Thanks!