iOS 11.2.5 (build 15D5059a) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2018-01-17T18:04:53Z. The update package is 154.55 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: 3da1618b9fd39f1109f075a18f55c1200263512a.zip.