Using this tool will restore the RootFS to its stock state and reset the user data. So creating a backup using iTunes before using it is recommended.
- The Cydia version supports all devices running iOS 11.0 to 11.4 Beta 3.
- The Jailed version supports all devices running iOS 11.3 to 11.4 Beta 3.
- The 11.2 to 11.2.6 support has been added to the Cydia version.
- The 11.0 to 11.1.2 support will also be added in the near future.
Although there's an option to not perform a full restore and keep the user data, I would really not recommend it, since it will leave a lot of left-overs from your jailbreak.