Reverting an iPhone’s operating system to a previous version involves installing an older iteration of iOS onto the device. This process contrasts with updating, where the newest software is installed. For example, an individual might attempt to install iOS 15 on a device currently running iOS 16.
The practice of reverting to prior software versions can be driven by several factors. Compatibility issues with newer apps or features, performance degradation on older hardware, or simply a user preference for a previous interface can motivate the action. Historically, this was a more common practice when updates introduced significant changes that users found detrimental to their experience. However, it is important to note that Apple generally discourages, and actively hinders, this procedure.