When updating my iPhone from settings the only option is iOS 13.X, however I am currently on 12.4.1 and want to simply go to the still current patch version 12.4.3 which came out just a few days ago.
Is there a way to make the phone go to the minor build update instead of forcing to 13.X? I want to avoid iOS 13 until a couple of fixes come out that address the major issues plaguing that update, but don't want to have current security holes in my current version.
There was a similar question here: Upgrade iPad to newer (but not latest) iOS but it had to do with a middle jump to an already revoked older version i.e going from 6 to 7, when 8 was the current version, so my question is different in that both versions are currently signed by apple.
Best Answer
Good question. My guess is that you can do it if:
you use iTunes
Apple is signing an '.ipsw' file for your iPhone model.
If I was trying to do this, I would look at https://ipsw.me/product/iPhone.
They seem to have a good / easy system for figuring out what is available for which iPhone.
Update:
If you have a 6s, it does not look like that model is supported. At least that is what I gather from looking at https://ipsw.me/12.4.3.
Update 2:
https://iosindex.com/iphone also reminded me that there are at least two versions of the iPhone 6s, the "GSM" version and the "everyone else" version. Their pages for each are linked below:
iPhone 6s (GSM)
iPhone 6s (Global)