tvOS 13.4.8 (build 17M5545a) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2020-06-09T17:27:44Z. The update package is 73 MB. This is a delta (partial) update that requires 13.4.8 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: df236e226726c781ef1203a1d7cc84b71cde4640.zip.