iOS 11.2.5 (build 15D5049a) is an official Apple over-the-air update for the iPhone 6s, released on 2018-01-03T18:16:28Z. The update package is 113.69 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: 7380d576c04c63f5dbcdcb91ecbd93350144a822.zip.