iOS 11.2.5 (build 15D60) is an official Apple over-the-air update for the iPhone 6s, released on 2018-01-23T18:30:53Z. The update package is 446.95 MB. This is a delta (partial) update that requires 11.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: f056e4e6d7d217cb427b2414816632e82a13df80.zip.