Apple closes iOS 8.4.1 and iOS 9.0 signing window after releasing iOS 9.0.2
Apple has stopped signing iOS 8.4.1 and iOS 9.0 firmware file after releasing iOS 9.0.2 yesterday.This means that users can no longer upgrade or downgrade to iOS 8.4.1 or iOS 9.
Downgrading is useful in cases where the previous iOS software update can be jailbroken. So it would have been useful if it was possible to downgrade to iOS 8.4, which can be jailbroken using TaiG and PPJailbreak. But since iOS 8.4.1 cannot be jailbroken, downgrading wasn’t a viable option for jailbreakers. Some users also may want to downgrade back to iOS 8.4.1 after they faced issues such as performance problems after upgrading to iOS 9.
Apple has used this strategy to keep jailbreakers at bay. It not only releases new software updates, that fixes the vulnerabilities used by the jailbreaks, it also stops signing the older iOS firmware file, which prevents users from downgrading back to the older iOS version that can be jailbroken.
This is big news, because an iOS 8.4.1 jailbreak has been rumored to be in the works. If you didn’t heed our advice about updating or downgrading to iOS 8.4.1, then it’s too late to do so now.
What we can say for sure is that the last vestige of iOS 8 is now a thing of the past. On to iOS 9 !