iOS 12.4 (build 16G5056d) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2019-06-24T17:17:26Z. The update package is 287.96 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: bc1fc58a6ec3f31d3b7d0e326bd5c2e4d16b59be.zip.