iOS 8.0 (build 12A365) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2014-09-17T17:54:04Z. The update package is 1.13 GB. This is a delta (partial) update that requires 7.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 7c39543ed69b53e871811f50b2141c5f321fb24c.zip.