iOS 12.1.1 (build 16C5050a) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2018-11-15T18:04:55Z. The update package is 289.68 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: b9682bcd08d7a680e4e8c4b29b84a291727ad251.zip.