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Is it necessary to upgrade to 13.51 system for iPhone 7 and 12.4?

Personally, I think it can be upgraded.

After the iPhone 7 is upgraded to iOS13.5.1, there is almost no difference between the system software running speed and iOS13.5. However, the performance of running third-party software is very eye-catching. You can see that when opening some games, the loading speed is very fast, leaving iOS 13.5 far behind. The gap is very large, and the battery life is not affected.

The smoothness improvement of this upgrade is obvious. The most important and core thing is to solve the broken touch problem commonly reflected in the previous iOS 13.4.1 version. The switching between system applications and the movement of the touch bar are smooth. It is worth mentioning the opening speed of applications. The details of the update also mentioned that the opening speed of applications has doubled with this upgrade, so for older models, this is good news.

Extended information

Apple cannot downgrade after upgrading to 13.5.1 system

After Apple released iOS 13.5.1, it stopped code signing for iOS 13.5, effectively It prevents users from downgrading to the previous operating system, which also means that as long as the system is upgraded, jailbreaking will become impossible again. ?

Stop signing means that users can no longer download outdated operating systems from Apple’s servers. It is customary for Apple to regularly stop signing old code after releasing a new version of iOS to prevent users from installing past iOS versions. , this practice protects users from new threats and ensures devices are running the latest software.

Before iOS 13.5.1, Apple pushed the more substantial iOS 13.5 update, as well as the corresponding iPad OS, macOS, tvOS and watchOS versions, with new features related to COVID-19. In addition to the public launch of the Apple-Google exposure notification system, these operating systems also provide a faster Face ID unlocking process for users wearing masks.