iOS 12.1.2 (build 16C101) is an official Apple over-the-air update for the iPhone SE, released on 2018-12-17T21:07:18Z. The update package is 1.35 GB. This is a delta (partial) update that requires 11.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: b29c1937b8043d6d196b98772e5f5799d967daa1.zip.