How do I update the firmware on an Apple TV 2nd generation?
How do I update the firmware on an Apple TV 2nd generation?
How do I update the firmware on an Apple TV 2nd generation?
You cannot update firmware however you can update TV OS. I would recommend looking over https://support.apple.com/en-us/HT202157 and follow:
The last update for the Apple TV (2nd generation) was in 2014 (v6.2.1). No newer software is available for that model.
How do I update the firmware on an Apple TV 2nd generation?