iOS 15.7.3 (build 19H307) is an official Apple over-the-air update for the iPhone 6s, released on 2023-01-23T18:49:12Z. The update package is 690.44 MB. This is a delta (partial) update that requires 15.6.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 3fbd73821b597ca9d3fc5874892928b3f4daa8d1.zip.