tvOS 12.1.1 (build 16K5044a) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2018-11-15T18:08:11Z. The update package is 40.36 MB. This is a delta (partial) update that requires 12.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 2e96ef214503ba78ced3d133184e4abdf497b816.zip.