https://wccftech.com/finally-unc0ver-jailbreak-released-for-ios-12-ios-12-1-2-heres-everything-you-should-know/

After resting in the development phase for months, the @pwn20wnd team has finally released 31 unc0ver 3.0.0. That’s right, the wait is finally over and you can install unc0ver jailbreak for iOS 12 – iOS 12.1.2 right now which also features Cydia and Substrate compatibility. At this point in time, the jailbreak tool only supports A8X – A11 powered iOS devices like the iPhone 7, iPhone 8 and iPhone X. Support for A12 devices will be added soon in a future update. Let’s dive in to see some more details on the matter.

If you’ve been following the news previously, it was stated that the unc0ver jailbreak for iOS 12 – iOS 12.1.2 will add support for iOS devices with an A12 processor. At this point in time, the support od only present in A8X through A11 chips. With the release of the latest beta, you now have the option available to jailbreak your iPhone or iPad running iOS 12 – iOS 12.1.2.