I dont know how you manage to do this but try turning it upside down, use a magnetic screw driver & try to drive it out at an angle instead of straight.
Better take help from someone with great hands on such fine screws & as your screw thread might have flattened you really need someone expert.
Again if in warranty get it repaired but be careful with the wafer or it might get screwed. Be sure to ask anything out until you find the solution.