iOS 13.5 (build 17F5054h) is an official Apple over-the-air update for the iPhone XS Max, released on 2020-04-29T17:07:20Z. The update package is 450.16 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: 3aa2df4ceb0bca2bc595d3929b8accbd933e6534.zip.