iOS 8.3 (build 12F5047f) is an official Apple over-the-air update for the iPhone 5 (GSM), released on 2015-03-12T16:56:09Z. The update package is 73.37 MB. This is a delta (partial) update that requires 8.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 486919f44987a1330ef4e9ca48cc6d399da4d9d8.zip.