iOS 12.1.2 (build 16C101) is an official Apple over-the-air update for the iPhone 8 (GSM), released on 2018-12-17T21:06:09Z. The update package is 1.44 GB. This is a delta (partial) update that requires 11.4.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 65def9b11c072a45350c24910c8dde75ef512838.zip.