Apple has currently closed the shsh channel and cannot complete the downgrade operation.

Since Apple no longer performs code signing for iOS 7, users who upgrade to iOS 8 will no longer be able to roll back to the previous version of the system.

iOS is a mobile operating system developed by Apple. Apple first announced this system at the Macworld conference on January 9, 2007. It was originally designed for use with the iPhone, and was later applied to iPod touch, iPad, Apple TV and other products.