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
http://www.gpspassion.com/FORUMSEN/topic.asp?TOPIC_ID=81990
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.
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BTW, I wanted to try the same for my friends non brand GPS (marked 737) so we have a go. Open it up and the motherboard looks different (but a MTK chipset in-situ and it is a new board, marked 2008). Anyhow, we tried the QstarzGPSview program and it works without resistor. On mine I did try to change first without success. That is before the resistor went in.
I guess people with MTK chipset bluetooth GPS can have a go with the GPSview software first before opening it up.