iOS 13.1 (build 17A5837a) is an official Apple over-the-air update for the iPhone X (GSM), released on 2019-09-10T20:23:50Z. The update package is 258.19 MB. This is a delta (partial) update that requires 13.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: fd9830bbe207f6c5e24b26cb9d1bc76ad52aba88.zip.