I've not done this myself and you may want to call Neptune first but I think in order to put control of the pumps back to the pump drivers and away from the WXM you have to clear the pumps memory, then assign the master, then assign the slave(s). Essentially what you had to do to make the WXM the master. The steps are documented in the VorTech manual that comes with the pump. Of course, you would do these with the WXM turned off and disconnected. I don't think you have to touch the firmware.