Seems some people are finding problems with an incomplete download or an inability to boot, when trying to update their Apply TV to version 5.1.1. It turns out that there is a glitch with updating the Apple TV this go around over ethernet. If this has been happening to you, you can disconnect the ethernet and connect via Wi-Fi, try your update and then feel free to connect the ethernet up again.
If that incomplete download of the firmware has left your Apple TV not bootable, you will need connect the device to your computer using a micro USB cable and do a restore via iTunes.
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