Removing bluetooth*step 26* screw will not budge*screw head w disfigur

I'm trying to replace a bluetooth in my macbook early 2008. In trying to remove screw to speaker in step 26 so I can get to the the bluetooth, I have damaged the screwhead because I tried every tool I had and still the screw will not budge. Too tiny and too much in the way to use a hacksaw.

It's the only screw in all those I've removed that is truly stuck. All this work and patience and I'm dead in the water. Any suggestions are welcome. Thanks! Mary