iOS 15.7.3 (build 19H307) is an official Apple over-the-air update for the iPhone 6s, released on 2023-01-23T18:49:09Z. The update package is 3.41 GB. This is a delta (partial) update that requires 12.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: e3e9d13efafe598c3d2517465137ac1249265f8a.zip.