Updates 3/7/2019: Apple is no longer signing iOS 12.1.1 beta 3, meaning this guide will not work. If you’re on a non-jailbreakable iOS version and want to downgrade or are on iOS 11 or below and want to upgrade to iOS 12 and jailbreak, you can currently do that by restoring to iOS 12.1.1 beta 3 using iTunes. Apple is currently still signing this version of iOS for some reason and it also happens to be jailbreakable using unc0ver. [Read More]