iOS 13.5 (build 17F5054h) is an official Apple over-the-air update for the iPhone 6s, released on 2020-04-29T17:07:26Z. The update package is 170.75 MB. This is a delta (partial) update that requires 13.4.5 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 69e0367363435b6ae51a5d31921449a0f64f801d.zip.