iOS 15.7.3 (build 19H307) is an official Apple over-the-air update for the iPhone 6s, released on 2023-01-23T18:49:11Z. 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: 4dbcd693551f646ed44f5e553dd7f0d0f46998c9.zip.