iOS 12.1.3 (build 16D5039a) is an official Apple over-the-air update for the iPhone 8 (GSM), released on 2019-01-10T18:08:57Z. The update package is 56.19 MB. This is a delta (partial) update that requires 12.1.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: b3a8bdce39207f1916559a51b931f1473adbf6af.zip.