Apple routinely stops signing "older" versions of iOS -- where "older" means anything older than one or two releases from the current version -- so no, your plan is not going to work.I bought my 2017 car in the last month before the 2018 model came out. The models that came out earlier had some callbacks. My car has had no problems at all. This is how I deal with iOS updates. So I will stay with iOS 16 until iOS 18 approaches. Then I will update to iOS 17.