After the release of iOS 16.4.1, Apple stopped signing iOS 16.4, preventing iPhone users from downgrading to that version of the software.
iOS16.4 It was a major update that added new emojis, web push notifications through Safari, and changes to the beta opt-in method. This update also reintroduced the classic Apple Books page turning animation and brought back the new HomeKit architecture and new shortcuts.
This disruption will also affect potential jailbreaks as an iOS 16.4 unlock would now be useless for those who have already updated to a newer version.
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