What it means — Apple
If an issue occurs during a software update on your Apple TV, unplug your Apple TV, then plug it back in and try the software update again.
What to do — Apple
- 1 If you see a warning symbol while trying to update the software on your Apple TV, or see a black screen on your TV and flashing indicator light on the front of your Apple TV, your Apple TV might need service.
- 2 If you see a warning symbol while trying to update the software, or see a black screen on your TV and a flashing indicator light on your Apple TV, you can restore your Apple TV.
Read the full article for pictures and model-specific details: If you see a warning symbol on Apple TV ↗