iOS 8.1 (build 12B411) is an official Apple over-the-air update for the iPhone 5 (GSM), released on 2014-10-20T17:59:08Z. The update package is 999.11 MB. This is a delta (partial) update that requires 7.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 48893df70e5c6d7a91157faa375b239f00b61a14.zip.