iOS 11.2.6 (build 15D100) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2018-02-19T21:13:45Z. The update package is 511.7 MB. This is a delta (partial) update that requires 11.0.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: ad4b8603eb31b75ce9d84da4c08118d40bafe6ea.zip.