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 2.33 GB. This is a delta (partial) update that requires 14.5 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 3a5540a5e3c81092b28b5b283dcd64dd2f4bdf33.zip.