iOS 12.3 (build 16F5129d) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2019-04-08T17:05:07Z. The update package is 297.72 MB. This is a delta (partial) update that requires 12.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 5955e178d29f3aa344225f364cb99a1a4182fcb1.zip.