I still can't get my head around the orientation of your flute.
When the fipple (with blowing notch) is directly below your chin, facing forwards, are you able to reach for the finger holes at all? Or are you turning the flute to finger in the vertical position, and blowing through the fipple notch, facing your chest?
The bottom 2 holes are inconsequential if you have 4 holes. These are designed so that you can thread a tassle like this:
Please note - as garish as this is, it won't improve your tone nor playing
Are you also applying the correct fingerings?
Here is one of the better web resources:
http://www.oldflutes.com/world/chinese.htm
http://www.chinese-flute.com/learn_dizi.php
which also has precise fingering charts for your flute.
If you are only getting the limited tones, equivalent to a NAF, then you might ask on the
http://forums.fluteportal.com/ since they have more expertise with these kinds of flutes. I don't think yours is a NAF however - it looks like you could probably turn it back into a proper transverse blown dizi by uncorking the end, and repairing the notch, and adding a membrane to one of the blow holes!