It's starts similar to onboarding a new router or doing a hardware refresh, you need to get the new router added to your controllers, get the router communicating with the controllers then push the new template. We typically push with a temp system IP so it doesn't overlap with the old one.
After getting the new one online and we're satisfied it's working, we'll invalidate the crashed/RMA/refreshed device, remove it from the controller then set the system IP to what the previous one was.
