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 341.08 MB. This is a delta (partial) update that requires 13.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 4eaf23f56c98c36e0439358759ab4c40dffae4fb.zip.