Once chosen, assuming it's the correct file & still being signed, then the update will proceed in the same way as any regular update. If you download one of these, then in iTunes you Opt ⌥ click the Update button & you will be asked to choose a file to update from, rather than the automatic process. They are only useful for as long as Apple are still signing the update - usually a couple of weeks after the next update is released the window of opportunity can be short. Although many users find this convenient, some people may be annoyed if the. They do not store the content, merely the correct addresses to where Apple keeps these updates. Generally, iTunes should check for new updates to its version about once per week. ipsw files for all devices, going back into the mists of time. If, as in this case, there is a security update for an earlier iOS then you may have to fetch it manually. If you are trying to update to the latest iOS, then iTunes will usually find the correct file for you. ipsw file, & run it manually from iTunes Normally, if you have difficulties updating OTA, then you can manually fetch the updater, an.

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