change operating software from 4.5 to 4.2

I need to change the operating system of my blackberry 8830 from 4.5 to 4.2, the 4.5 software will not allow bluetooth to pair with my car.
scottresnickAsked:
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amorgan2000Commented:
Uninstall the 4.5 firmware off your computer and make sure the 4.2 firmware is installed.  You should then be able to downgrade it.  Let me know if that doesn't work.  You may need to use a program to wipe all software off the device first, then do that.  I can post those instructions and the file if needed.
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ALogvinCommented:
You will need to use the javaloader tool that RIM provides to wipe a newer OS. Installing the 4.2 OS will not downgrade.

Guide:
http://www.blackberryforums.com/blackberry-guides/4173-user-using-javaloader-exe.html

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