Screwhead overturned, now what?

So I’m new here for the first time hi Two weeks ago I crashed with my z1000 06. Among other things, the Lima lid broke against. I wanted to replace it yesterday and when trying to remove the winding of the alternator from the old lid, I slipped with the screwdriver and turned over the head with a screw. The screw is still bomb-proof. How can I get it out now without damaging the winding? MfG