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how do you hookup apple tv 4k to at&t tv?
only way to hook up an appletv is to connect it to ac power and then connect it by hdmi to a tv which has a hdmi1.3 port or later
and in many cases one needs to use the tvs remote to set the hdmi port one connected it to as active inputs source
Set up your Apple TV - Apple Support
Once set up, download the AT&T TV app from the on-device App Store.
How do Apple TV 4K works with AT&T TV
