iOS 11.2.6 (build 15D100) is an official Apple over-the-air update for the iPhone 5s (Global), released on 2018-02-19T21:13:51Z. The update package is 1.09 GB. This is a delta (partial) update that requires 10.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: a22cde145e0b27a5deb25d1b605989de4a980ca3.zip.