iOS 9.0 (build 13A344) is an official Apple over-the-air update for the iPhone 5 (GSM), released on 2015-09-16T18:02:14Z. The update package is 860.23 MB. This is a delta (partial) update that requires 8.4.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: e0c80fcb7f13246de07bf3b165cf7319792c7085.zip.