Iphone 4s Bluetooth problems after upgrading to IOS 6.0

I use the bluetooth to connect my Iphone 4s and my car stereo (Alpine CDE HD138BT) Prior to the IOS 6.0 Upgrade when I streamed music from both Pandora and my music files I was able to view the artist, song, album on the stereo and even use the stereo control buttons to skip tracks, search, etc. After the upgrade I can still pair the two and play music but I lost all of the other additional features and can no longer see the information or control it from the stereo. I have deleted the pairing on both and then re-established again but that didn't fix the problem. I found on the stereo specifications that it uses Bluetooth version 2.1. Is there any way to force the Iphone to revert to a previous version of bluetooth? (I am also going to post on an Alpine site to see if they plan on doing an upgrade.)