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 272.2 MB. This is a delta (partial) update that requires 12.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c3b289537d17e2bcedf65043ab2d356d2114fb9c.zip.