Hi there buddy,
Don't worry I had the same problem and have fouind the hack. Here it is:

Multi Region Code for the DVD Player DZ111
1.Turn the player on (without disc inserted)
2.Open the disc tray
3.(Press PAUSE)
4.Press 0,0,0,(0)
5.Enter RC (1-6; 0=region free)
6.(Press PAUSE)
7.Turn it off

I hope this is of some help.
Enjoy!
opbou