iOS 12.4 (build 16G5027g) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2019-05-15T17:05:42Z. The update package is 207.55 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: d91db0227f8511e951784cf8e5fc491f7f0bf8bf.zip.