Mine are slightly older than the one pictured and this is what I did to get it off:Use a large flat screwdriver to push the clip (the part the boot locks into) forward/open. This will relieve the pressure on the boot release button. Use a second large flat screwdriver to pry the button off of the binding. Be gentle. Use a Phillips #3 to remove the three screws that hold the toe piece.

You should use a Pozi-drive screwdriver when you work with ski bindings as that is what the screws are designed for.