iOS 13.4.5 (build 17F5044d) is an official Apple over-the-air update for the iPhone XS, released on 2020-04-15T17:15:42Z. The update package is 382.87 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: 408e184516802621fc538beb5111611f10dcc723.zip.