It was found that a new tool - it's just a low-quality copy of the jailbreak unc0ver with a different interface. The tool was Tw3lve with private access, otherwise everyone would immediately recognize that it is a copy.
However, developers still managed to figure it out pretty quickly. If you are one of those who managed to download the jailbreak Tw3lve, we recommend to remove it immediately and do not use. Using the tool may endanger the safety of your device. In addition, it can lead to a complete loss of the jailbreak.
Instead, it is recommended to use unc0ver-tool jailbreak for iOS 12.0-12.1.2. It is a reliable and proven tool with support for all models except devices with an A12 (X) processor. However, this will soon change, and they will receive support.
Last week came out already 49 beta version unc0ver 3.0.0 with bug fixes. The public version of the tool will be released when support for A12 (X) devices is added. You can download unc0ver from the Pwn20wnd repository on GitHub.
Once again we remind you to be more attentive to what you install on your device. We will definitely warn you if something like this happens in the future.
All Jailbreak iOS 12 - iOS 8 Supported Devices.