iOS 11.2.5 (build 15D5059a) is an official Apple over-the-air update for the iPhone 6s, released on 2018-01-17T18:04:54Z. The update package is 154.58 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: 43f362fa72156808ca334760133f7610f751f27a.zip.