iOS 9.1 (build 13B137) is an official Apple over-the-air update for the iPhone 5 (GSM), released on 2015-10-12T16:56:55Z. The update package is 1.16 GB. This is a delta (partial) update that requires 9.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 52beb3f9265a980027bd8224f03891720082bb13.zip.