Does Apple TV work on older Apple TV models?

Beas65 Said:

"Does Apple TV work on older Apple TV models?"

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Yes. These Apple TV Versions:

• Apple TV 4K and Apple TV HD updated to the latest version of tvOS
• Apple TV (3rd generation) updated to the latest version of Apple TV software

Source: Devices you can use with the Apple TV app and Apple TV+ - Apple Support

What model Apple TV do you have? Identify your Apple TV model - Apple Support

Unfortunately, the Apple TV+ subscription service, or the Apple TV app, is not available on the Apple TV (2nd generation).