We have 3 sites with Mitel 5000 HX of various firmware levels. We want to have a spare in case one fails due to hardware, environmental, etc. They are very cheap on eBay. Can I just unplug the old one and plug the new one in? I would imagine I can just swap all the cards from the bays and the CF over to the new unit? Will moving the compact flash move the programming and licensing? I am in the process of figuring out how to get Mitel certified so bear with me.