iOS 11.2.5 (build 15D60) is an official Apple over-the-air update for the iPhone 6s, released on 2018-01-23T18:30:51Z. The update package is 1.13 GB. This is a delta (partial) update that requires 10.3.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: ac741ddbadb2f543d65ccb217c910d563132c859.zip.