iOS 12.4 (build 16G5027i) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2019-05-20T17:07:20Z. The update package is 207.65 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: 95e0bba1a686a52b3d484e4d91d7d1c74bfc3688.zip.