iOS 15.7.3 (build 19H307) is an official Apple over-the-air update for the iPhone 6s+, released on 2023-01-23T18:49:16Z. The update package is 3.16 GB. This is a delta (partial) update that requires 13.2.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 56bd3d0c8ba44b4e61a93886b099220052e9d13a.zip.