Here is where you will be able to grab latest iOS iPSW files to use to Restore/Update via iTunes. I separated them per device. This page will NOT include Beta versions. So please do not ask, as betas have their own guides. Also page will always be updated with latest versions as they come out 😉
P.S : Unfortunately there is (currently) no way to restore to the Apple Watch OTA files.
For the average iOS user, these won’t be particularly useful. Collecting them for future reference, and for if at some point they do become useful.
~~ Updated to iOS 11.0.3 ~~