iOS 9.9.16.5 (build 20F66) is an official Apple over-the-air update for the iPhone X (GSM), released on 2023-05-18T17:13:46Z. The update package is 4.5 GB. This is a delta (partial) update that requires 12.1.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c05206dde37d2cbc8e39050247e2c91fa10c6d94.zip.