iOS 11.2.5 (build 15D5049a) is an official Apple over-the-air update for the iPhone 5s (Global), released on 2018-01-03T18:16:24Z. The update package is 113.23 MB. This is a delta (partial) update that requires 11.2.5 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c27d83a55a3eae8ae69d527cf2ccba74739a18ff.zip.