Bluetooth problems

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About two weeks ago I upgraded my rom so I could tether my XV6700. I had the original rom from when I bought the phone, about June of 2006. Up until I did the update my bluetooth worked fine connecting with my car's Pioneer bluetooth adapter.
Now, after the update, I can't get them to connect. I have tried cooking my own ROM, Helmi's version, and it still won't connect. The phone sees the stereo but the stereo keeps giving an "invalid device" error. I have tried the jetwaremoble stack and it works better, but not all the time.

I really wish I could find the original rom and go back to where the phone was two weeks ago but all I can find is the current and the previous rom, from UTStar anyway.

Is there any other bluetooth stack I could download and try? Or any other suggestions?

Thanks,
Gary