Apple TV 4K yellow triangle
If your Apple TV 4K shows a yellow triangle, what should you do
Question marked as
Contact Apple Support for assistance, to have them restore the system software on that device. For the 4K model, users can’t do this themselves.
If you see a warning symbol on Apple TV - Apple Support
If you have an Apple TV 4K
If you see a warning symbolwhile 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, contact Apple Support.