Continuing the post...
I have a nuvi 660 and want to pair with my headset. According to x-trail's message, my unit is able to do it.
However the headsets I have are set with the passcode 0000.
Nuvi 660 is set to 1234 pass.

So I have 2 options:
1) Is there a setup tool or a hack to nuvi 660 to change the passcode to 0000 instead of 1234?

2) (I think the hardest): find a software or an app that may connect to my headset and set it up, like Scala Rider can do. Unfortunately my headset is a generic from China, but a pretty good one. So are there any softwares or apps that you guys could recomment to me to try to connect to my headset and change the passcode (or even other features?)?