Originally Posted by peterc10

The firmware will always be 1.5, until we get 2.1. There has been no other official release. What ROM are you using (or Build No)

I think your problem is a faulty switch. There is a little mechanical switch that works when you insert headphones and switches sound over to those headphones. You could try putting the jack in and out a few times to see if it "frees" it. Otherwise it is a repair or change of phone I suspect.