As it regularly does, the Californian firm has just stop signing a recent version of iOS 15. This is iteration 15.3 precisely.
This means that iPhone and iPad users cannot update their device to iOS 15.3 or iPadOS 15.3. They can, however, update to iOS 15.3.1 and iPadOS 15.3.1, two new versions available for download since last week.
And for those who have already updated their machine to iOS or iPadOS 15.3.1, the return to iOS/iPadOS 15.3 is no longer possible.
This strategy may seem surprising at first. But in reality, it is classic for Apple. It makes it possible to push iPhone and iPad users to the latest version of the system to date. Thus, in addition to inflating the statistics concerning the fleet of up-to-date iOS and iPadOS machines, the maneuver prevents the use of an OS version with more security vulnerabilities than the most recent iteration.
Precisely iOS 15.3 presented a major security breach affecting Webkit and web browsers. Version 15.3.1 had come to address this problem, among other more minor improvements.
Along with the evolution of iOS and iPadOS 15.3 for all, be aware that iOS and iPadOS 15.4 are in beta testing. Both systems should arrive in final version for all during the week of March 8 possibly, in parallel with the release of a new iPhone SE.