iOS 8.3 (build 12F5061) is an official Apple over-the-air update for the iPhone 5 (GSM), released on 2015-03-24T16:54:13Z. The update package is 100.47 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: 37565cfb52047a3427bd6016e28eb2cf264b6d08.zip.