iOS 9.9.12.3 (build 16F5156a) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2019-05-10T17:09:39Z. The update package is 2.15 GB. This is a full OTA update that can be applied from any compatible base version. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 45d6b225a7205ca8611ab2f2a83d369f91c86732.zip.