iOS 12.1.3 (build 16D5032a) is an official Apple over-the-air update for the iPhone 7 (GSM), released on 2018-12-19T18:07:09Z. The update package is 314.95 MB. This is a delta (partial) update that requires 12.1.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 54ba5f24cbd1c745f22c85fae94f2d9b5d1a191c.zip.