iOS 11.2.5 is latest public firmware version available and developers have been seeded with iOS 11.3. If you accidentally update or restore, you'll find yourself on iOS 11.2.5.
Jailbreakers, especially those on iOS 11.1.2, should take care not to update as saurik is working on a jailbreak with full support for Cydia and Cydia Substrate. Additionally, the liberiOS jailbreak for iOS 11.1.2 is already available.
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