As the title says. I need to remove this type of screw, but don't know what tool to use.
Does anyone know where can I get the screwdriver for this?
Looks like you need an 8-point socket. It is hard to tell the size from the picture but it looks small, you will probably need one in 1/4" drive. If you want a driver for it, you can get a 1/4" drive socket drive handle.
It's called a safety torx bit. Torx has no pin in the middle.