Apple has stopped signing iOS 9.0.2 firmware file, just over a week after releasing iOS 9.1 which killed Pangu Jailbreak. This means that users won’t be able to downgrade from iOS 9.1 to iOS 9.0.2 and jailbreak your device.
This can be confirmed by visiting ipsw.me, a website that provides real-time signing status for iOS firmware files. Green tick means that Apple is still signing the firmware file, and red warning sign indicates Apple has stopped signing the firmware file.
Downgrading is useful in cases where the previous iOS software update can be jailbroken. It was useful as it was possible to downgrade to iOS 9.0.2, which can be jailbroken using Pangu jailbreak. Some users also prefer to downgrade back to the older version if they face problems after upgrading to the latest iOS software update.
Apple had patched two vulnerabilities in iOS 9.1 which were used by Pangu Team in their jailbreak tool for iOS 9 – iOS 9.0.2 to prevent it from being used to jailbreak iOS 9.1.
This doesn’t come as a surprise as for the last few years, Apple has used this strategy to keep jailbreakers at bay. It not only releases new software updates that fixes 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.
Pangu Team hasn’t provided any update about the jailbreak for iOS 9.1 or iOS 9.2 (Apple seeded the first beta version of iOS 9.2 earlier in the week).
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