iOS 9.9.17.1.1 (build 21B91) is an official Apple over-the-air update for the iPhone XS, released on 2023-11-07T21:29:37Z. The update package is 5.58 GB. 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: fc55da6cc108bfe7a923bba34bd3e6f2a0e8a8e4.zip.