iOS 12.4 (build 16G5069a) is an official Apple over-the-air update for the iPhone 6s, released on 2019-07-09T17:16:28Z. The update package is 100.66 MB. This is a delta (partial) update that requires 12.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: d0c807d4e7b3998aaf775286189eb9b3a871edff.zip.