How do you exit DFU mode and how do you hard reset the Apple TV 4?

how?

and where is this information from apple?

You need to install the latest build of tvOS. Please find the instructions for getting your device up and running here:

http://adcdownload.apple.com/iOS/tvOS_beta/tvOS_beta_Software_Installation_Guide.pdf

I asked two questions, this answered neither

If your device is in DFU mode, you likely need to load in a version of the OS. Visit https://developer.apple.com/tvos/download/ to download the latest version, and follow the instructions to use iTunes to restore the device with the GM seed. This will get you out of DFU mode and effectively reset the device to factory.

How do you exit DFU mode and how do you hard reset the Apple TV 4?
 
 
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