I had a similar problem on my 7250; after the BT connection was lost, my attempts to re-pair it had the same problem with the connection screen popping up for an instant. What I realized after some searching is that I was not setting up the BT headset for proper pairing. You might want to double check your headsets user guide to verify the procedure. Once I had the headset set up properly, I was able to re-pair it.
I know this does not resolve the problem you have with getting the BT option enabled (you might try powering down and removing the battery - after re-inserting the battery and re-starting, it may work) but I hope it might be of some help.
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