Apple has stopped signing both iOS 11.1.1 and iOS 11.1.2, which means that downgrading or restoring to that firmware version is no longer possible. They have closed the signing window for iOS 11.1.2 just a few days after Ian Beer’s released his tfp0 exploit, to keep everyone’s data secure from hackers.
When Apple stops signing a particular firmware, this essentially means that iTunes won’t allow you to restore it anymore. Instead, you're prompted to update to the latest available firmware. In this case, that's iOS 11.2.1.
As for reason to stops signing an iOS version, perhaps it's a measure to thwart jailbreaking, which often requires older firmware versions without patches for the vulnerabilities used in the jailbreak process. It made impossible for consumers downgrade to firmware versions vulnerable to Ian Beer’s tfp0 exploit, which could bring jailbreak for iOS 11 users.
So we recommend that if you are on 11.1.2 and you want to jailbreak and you're eagerly interested in the jailbreak, then don't update to iOS 11.2.1, although Alibaba’s Pandora Lab Team have Successfully jailbroken iOS 11.2 and iOS 11.2.1, the bad news is the team won't release the untethered jailbreak to public users.
When Apple stops signing a particular firmware, this essentially means that iTunes won’t allow you to restore it anymore. Instead, you're prompted to update to the latest available firmware. In this case, that's iOS 11.2.1.
So we recommend that if you are on 11.1.2 and you want to jailbreak and you're eagerly interested in the jailbreak, then don't update to iOS 11.2.1, although Alibaba’s Pandora Lab Team have Successfully jailbroken iOS 11.2 and iOS 11.2.1, the bad news is the team won't release the untethered jailbreak to public users.
Via iDownloadBlog, Image Credit Gotta Be Mobile
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