I suspect the reason they are still signing 11.2.6 is 11.3 is quite new, I would expect them to stop signing 11.2.6 quite soon. But one thing seems sure is, the ‘rules’ (if they exist) are not made public.
I remember hearing a rumour, in early days of iOS, that for iPod Touch alone, they were more generous with in signing old versions. Can’t find any evidence for that, maybe I imagined it?
I’m an iOS developer in my spare time, so all of this is a sore point with me (and with many devs). I like my Apps to support previous versions as well as current. Some stuff I was doing this morning goes all the way back to iOS 9, as that was last version supported by iPad 2s, and people are still using iPad 2. So for testing and debugging on devices, I really want to be able to pick and choose any combination of device and valid iOS version, even if years old. But I cannot do so, I have to depend upon the sdk simulators.
