iOS 13.4 (build 17E5223h) is an official Apple over-the-air update for the iPhone XS Max, released on 2020-02-05T18:17:29Z. The update package is 828.75 MB. This is a delta (partial) update that requires 13.3.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 8733c6d602a93e3e568a2d594b1f145dc4d7b388.zip.