Problems with my "Quena" and Octaves

Hi there! I'm new here. I'm from Argentina and a good piano man. I also have others instruments. But now I want to ask about my Quena. I bought it in North-Argentina in my vacations trip.
So, now I want to learn how to play it and it was going good. But the problems started when I wanted to go to the high octave of the Quena
I searched online and find out that my Quena is probably a False one. Because its mouthpiece was quite different from that of an original Quena (Attached pictures of the instrument and the mouthpiece)
Do you know what to do? Any tips of how to reach high notes? Or it was a bad purchase?
Any answer is welcome!
P.D: Sorry for the grammar. Started english study like three months ago
 

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