Do you know what type of screw and bolt this is? Do you know the best way to unscrew it? It attaches my CCTV camera to the ceiling plaster (dry wall).
Those are "Mollys": (hollow wall anchors)
They don't come out,
the screw comes out (it's long so it comes out slowly), but the anchor part will stay.
It might be possible to drill out the anchor part from the front
Or maybe cut off the arms at the back, remove the nut fold up the stubs and eject the anchor body