I am pretty happy now... And why? Because as I suspected, the problem with my connections between the note II and the Fiio E07K where the cable. Here my experience:
1. I tried several kind of cables, from adapters to... almost everything. As someone pointed, they weren´t "OTG" cables. "On the go" for Micro USB cables means that one of the five pins is connected to another ground pin, telling the device that is connected to another device which can manage. This said.
2. I bought Lindy USB 2.0 Cable Micro-A/Mini-B 0.5m, which is OTG. Big disappointment at first, because it is A, and I didn´t realize it does not fit in my note II. As I had an useless cable, I decide to manually sand the chamfers.
3. I got the cable to connect with my note. As soon as I connect the cable (even with nothing else connected in the mini USB side) I get the next message: "Conector USB conectado" (USB connector connected).
4. Time to connect the Fiio E07K. I just tried connecting the cable first to the Fiio, then turning on the Fiio, and then connecting to the phone. Then I start "Your song" of Elton John in spotify and put on my Jaycar Pro Monitor. Sound is clear and defined!
Enjoying it right now...
Wondering right now if I sold my Fiio E17 very fast...
You cant use it as dac unless you have a middleman power source in between.