I have performed a miracle. Yes, because I am a total noob in electronic this is major for me.
I have a iBlue 737 sitting at home since I have purchased the Qstarz extreme. I guess may as well to try to change it to 5Hz. I have nothing to lose.
The follow link explain it all
You need a QstarzGPSview.exe program to do it. I have it from Qstarz software. But I think you can download it for free.
EDIT: To be exact, I have a 0.5W 1K Ohm resistor.