This brings an interesting question. How will you know if there is an update available for your mount or starsense without periodically checking cfm and connecting to the mount?
You don't unless somebody mentions in here. Celestron (like Microsoft) ought to have a Web page that lists updates, but don't. However, if you have the cables and have waded through the foggy process (installing Drivers & latest Java etc) it doesn't take more than a couple of clicks to periodically check.
But as a general rule, "if it ain't broke don't fix it". A firmware update might even introduce a problem particularly if you are using any third party applications. Most updates are to fix stuff that is probably irrelevant to your mount or location. I pursued development of this thread and updated all my kit as I had distinct problems with my Evolution and Starsense and discovered that my firmware was at least a year out of date, so it was an intuitive move to eliminate that. My kit now runs like a dream, so I don't intend updating it again (ever) unless I encounter a fresh running problem or read of a specific need.