Apple stops signing iOS 15.2, you can no longer update or restore to this version
Apple has stopped signing iOS 15.2 and you can only install iOS 15.2.1 on your devices anymore.
When Apple releases a new version of iOS, a few days later it stops signing the immediately previous version, preventing users from reinstalling it. The one known as downgrade, going back to a previous version of iOS, is not something that Apple likes and now have restricted going back to iOS 15.2.
In the past week Apple released iOS 15.2.1, an update primarily focused on bug fixes. At this time, iOS 15.2.1 is the only official version that you can install on your iPhone, the only alternative is the iOS 15.3 beta. The main reason Apple does this is to prevent users from installing old versions with bugs.
Many times, Apple manages to avoid Jailbreak with these decisions, as some older versions may be vulnerable to these types of tools.
The improvements that iOS 15 brought to the iPhone camera
Apple only allows you to restore and install iOS 15.2.1
If you have an old version of iOS or need to restore your iPhone for any reason, you will only be able to install iOS 15.2.1, since it is the only version that Apple signs. If you try, even manually, to install a previous version, the update will fail since when communicating with Apple’s servers it will not obtain the necessary signature to install.
The most normal thing is that this does not affect common users too much. Nobody doubts that iOS 15.2.1 is a more stable version and that it fixes important bugs. The only group of users that can be affected is jailbreak lovers, since Going back to previous versions of iOS is a common thing. With iOS 15.2 Apple closed an important door to jailbreak, which we understand is still closed with iOS 15.2.1.
When Apple stops signing software, there is no way to install an older version of iOS on iPhone. It is a security method that no one has managed to bypass.
Related topics: iOS
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Reference-ipadizate.com