iOS 9.9.11.3 (build 15E216) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2018-03-29T17:11:37Z. The update package is 1.59 GB. This is a delta (partial) update that requires 8.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 88db0cf253470d5a9597e203e1e6bfb882d0fb2f.zip.