I'm considering upgrading from my iPhone SE 64 GB to the 128 GB model. (Originally I was waiting for the iPhone SE 2, but if it has a glass back I prefer to stay with the current SE for the time being.) I'm currently running iOS 10 and do not want to upgrade to iOS 11 (due to some 32-bit apps, among other things). My question: Under what circumstances can I restore a backup from my iPhone SE 64 GB to an iPhone SE 128 GB device (possibly a used one) and still keep iOS 10? Does it matter if the new device has been manufactured/sold before or after the iOS 11 release? Does it matter if it has been upgraded to iOS 11 in the meantime? I suspect that it’s not possible to downgrade a brand new (i.e., sold by Apple now) iPhone SE to iOS 10. On the other hand, I assume that it should be possible to restore my backup to an iPhone SE that was sold with iOS 10 and that is still running iOS 10, without having to upgrade to iOS 11. Can anyone confirm that? And what about an iPhone SE that was sold with iOS 10, then upgraded to iOS 11, and then restored to factory defaults again? Should that work too? Thanks in advance for any insights.