iOS 15.7.3 (build 19H307) is an official Apple over-the-air update for the iPhone 6s+, released on 2023-01-23T18:49:18Z. The update package is 2.41 GB. This is a delta (partial) update that requires 14.4.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 44b445834d74a7ed0ffc40eda163300cbb610236.zip.