Bugman

Hi: I purchased a 994iZS unit thinking that I could use it with RCS Zigbee thermostats. Upon reading on the forums, I guess I made a mistake in my purchase. If otherwise, please advise. If indeed this is the case, is it possible to convert a 994iZS IR Pro back to 994iZ IR Pro unit for Zigbee device funtionality. Is this a firmware or radio fix and the associated cost? Thanks, Dan