iOS 9.9.11.2.5 (build 15D60) is an official Apple over-the-air update for the iPhone 6s+, released on 2018-01-23T18:30:56Z. The update package is 1.52 GB. This is a delta (partial) update that requires 9.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: b8e1a4264ccc8775b6e3dbd0d1d7243c8d28ed1c.zip.