Currently, Apple's latest firmware is iOS 11.4.1 and developers have been seeded with iOS 12. If you accidentally update or restore, you'll find yourself on iOS 11.4.1.
Those interested in jailbreaking should make sure to remain on iOS 11.3.1. The Electra Jailbreak has been released and you can find instructions on how to jailbreak here. Unfortunately, the signing window for iOS 11.4b1 - iOS 11b3 has also been closed.
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