iOS 12.1 (build 16B5068i) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2018-10-02T17:12:02Z. The update package is 263.56 MB. This is a delta (partial) update that requires 12.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 9b999123f82ef494b0d9401e12fc9ac74cc28919.zip.