The process of reverting an iPhone or iPad operating system to a previous version is technically termed a downgrade. This action involves removing the currently installed iOS software and replacing it with an older, signed version. For example, if a user has upgraded to iOS 17 but experiences compatibility issues with frequently used applications, a downgrade to iOS 16 may be considered.
Reverting to a prior system version can resolve performance issues, application incompatibility, or address user preferences concerning the software interface. Historically, Apple has maintained strict control over software versions available for installation on its devices. This control limits the window of opportunity to revert to older versions, as Apple typically ceases signing older iOS versions shortly after a new release to encourage users to remain on the latest, most secure software.