Car tunes vs bluetooth headset problem

[Danzogan]

First timer, need help.
I have a mogul 6800 from Sprint. I use a cassette player adapter to listen to my music off my phone in my car. It has always work flawlessly when a phone call was sent or recieved it would transfer right to my bluetooth headset and then back to tunes when done.
Since upgrade to latest mobile 6.1 it now attemps for a second but fails and the caller comes out my speakers and they can not here me as long as the usb headset adapter jack is plugged in. How can I fix this ploblem short of a cooked up os. I like the new upgrades in 6.1 and am not comfortable cooking.
I found the hack finnally at http://forum.ppcgeeks.com/showthread.php?t=30364
Please Thank them all and pass this hack on to all.