iOS 15.7.3 (build 19H307) is an official Apple over-the-air update for the iPhone 6s+, released on 2023-01-23T18:49:20Z. The update package is 1.23 GB. This is a delta (partial) update that requires 15.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: aa2991c1d5bb1d80f456f443a2e630290fc76f31.zip.