I don't really know why Software would fix a problem like this. NTS and ETS are backup Switches. They operate independently. When all else fails these should stop the Elevator. When performing a Buffer test and these Switches are jumped out, you slam into the Buffers. When they are left in the circuit and you perform a Buffer Test, they should stop you at or near the floor. So it may be worth a try before paying for a Software upgrade. You can move a switch in 20 minutes.
