iOS 9.9.10.3 (build 14E277) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2017-03-27T16:57:52Z. The update package is 1.43 GB. This is a delta (partial) update that requires 8.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: ba8f30d795176d36ba1aea4923142714b823e81b.zip.