Currently, Apple's latest firmware is iOS 11.4 and developers have been seeded with iOS 11.4.1, as well as iOS 12. If you accidentally update or restore, you'll find yourself on iOS 11.4.
Those interested in jailbreaking should make sure to remain on iOS 11.3.1. CoolStar recently announced that an Electra jailbreak for iOS 11.3.1 is coming soon. The jailbreak is based on a tfp0 exploit recently released by Ian Beer.
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