Apple often shortly after the release of new iOS, it stops siging the prior version, thus this step with iOS 7.1.2 isn't exception, despite it may be undesirable from some users, particularly, that they are facing some issues with iOS 8, or are unhappy with these new changes. Users who are jailbroken must to be aware of this.
We encourage those who are jailbroken on iOS 7.1.2 or lower to be careful when connecting their device to iTunes as it will prompt you to update. If you do update, you will lose your jailbreak.iOS 8 is not compatible with all iPhones, can only be installed on iPhone 4s and late. iOS 7.1.2 will remain available for iPhone 4 users.
Apple has release iOS 7.1.2 on June 30, is the latest version in iOS 7 path, which was include some bug fixes related with the security and email attachment encryption issue.
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