tvOS 13.3 (build 17K5445a) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2019-11-20T18:11:10Z. The update package is 1.62 GB. This is a full OTA update that can be applied from any compatible base version. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 87ac418ab8ea649f2547075e0d6f2c017079b11f.zip.