Problems with iPhone 3G software 4.2.1 and car/Bluetooth pairing.

I just upgrated the software on my iPhone 3G to version 4.2.1 and now the phone does not pair with the HandsFreeLink(TM) Bruetooth device in my 2005 Accura TL vehicle. It had worked fine for 3+ years until the software upgrade. Need help on how to fix! Thanks.

One of the issues that we have had since the latest upgrade (4.2.1) is with the radio function in general (both wifi and bluetooth). We have identified that the wifi security protocol stack has serious issues with key length and this can stop connections to the wifi systems such as TC and APE, but it also affects anyone using security string longer than 8 characters.
With bluetooth we noticed that the older pairing sequence was no longer working. The only way that we could clear this down was by deleting all pairing done earlier in both devices, resetting the network settings and then restarting the 'phone. Place the vehicle/headset/device into pairing mode AFTER the iPhone has completely restarted. Go into the GENERAL-BLUETOOTH settings and pair the device again, this should be all you need to do.
One thing to note is that some of the older bluetooth devices only support v1 of the bluetooth protocol stack and this causes trouble with the new update (don't know why yet but it looks like a handshake problem).
Finally - for BMW owners, the bluetooth stack in 4.2.1 can cause intermittent drop-outs if the car software has not been updated recently (prior to Jan 2010). If you need to pair your iPhone 4 or upgraded 3GS, you may need to take your car to a dealer to update the comms package to he latest version. The snap-in for the iPhone 4 is due from Jan 2011.
Hope this helps.

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