iOS 9.9.10.3 (build 14E277) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2017-03-27T16:57:54Z. The update package is 1.13 GB. This is a delta (partial) update that requires 9.3.5 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: dd344c5a0493ae5833dc84032dbbd15eb69efe4d.zip.