Turns off for iOS 10.2.1 and iOS 10.3!

Apple wants iOS users to always use the latest version. As of today, the company has stopped signing iOS 10.2.1 and iOS 10.3, which are lower than iOS 10.3.1.

Apple wants to encourage users to stay up-to-date, and after a period of time after releasing new versions of iOS, previous versions are turning away. Signatures were closed for iOS 10.2.1 and iOS 10.3 a week after iOS 10.3.1 was released.

Turns back to iOS 10.2.1 and iOS 10.3
Keeping user security in the forefront, Apple fixes many errors while closing security vulnerabilities in previous versions of iOS with every software update. Since this release of iOS 3.1, newer versions have stopped signing lower versions of iOS as they are released.

Find APFS and AirPodsum After a period of iOS 10.3 release, which is the newest, iOS 10.3.1 update is now available as a bug fix. Apple continues to sign up for iOS 10.2.1 because it updates so quickly, so today iOS 10.2.1 and return to iOS 10.3 has closed. The lowest version that can be installed now is iOS 10.3.1. Currently, iOS owners who have iOS 10.3.1 and iOS 10.3.2 beta installed will not have iOS 10.3.1 or lower.