https://wccftech.com/apple-has-stopped-signing-ios-11-1-2-downgrade-no-longer-possible/ >Slightly bad news for those who were awaiting a jailbreak as Apple has stopped signing iOS 11.1.2 firmware for both iPhone and iPad. >Google’s Ian Beer released the details on an iOS 11.1.2 exploit that could potentially lead to the first ever iOS 11 jailbreak for the public. While that’s all well and good, but now Apple has thrown a little spanner into the situation by ceasing to sign the aforementioned firmware. This means that if you were still ‘thinking’ about downgrading back to iOS 11.1.2, then you can’t do it anymore. The opportunity for downgrading has ended for good and there’s nothing you can do to get onto that firmware.