iOS 9.9.10.3.2 (build 14F89) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2017-05-15T17:02:38Z. The update package is 1.49 GB. This is a delta (partial) update that requires 8.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 523f2c3a1aca72baa4f5e8278395b5aa4514ef84.zip.