Electra Jailbreak is a semi-untethered jailbreak tool released by a hacker and a developer named Coolstar collaborating with Electra team.
The first ever Electra jailbreak tool released was for iOS 11 - iOS 11.1.2.
Now Electra for iOS 11.4 and iOS 11.4.1 have been released.
It supports for iPhone X, iphone 8 and iPhone 8 plus also apart from the other old devices.
Electra Jailbreak for iOS 11.4 - iOS 11.4.1
The newest version of Electra jailbreak 1.2.1 has released for iOS 11.4 - 11.4.1. This only supports for few iDevices because Apple is no longer signing iOS 11.4 for other devices.