Apple TV 4K yellow triangle
If your Apple TV 4K shows a yellow triangle, what should you do
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Best reply
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.