iPadOS 16.6.1 (build 20G81) is an official Apple over-the-air update for the iPad Air 4 (Cellular), released on 2023-09-18T17:21:24Z. The update package is 3.37 GB. This is a delta (partial) update that requires 14.8 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 4315eb5775cba2f6950255f5c261b1c8f42da79c.zip.