Right now I have one X1 DVR and 3 small recievers, and I have a 4K TV but it's not using the main X1 DVR box. Can I upgrade just that box to 4K and not pay for an additional DVR? Or if I need to replace the main DVR, can I keep all my recordings? Again I only have one 4K TV so I just want to upgrade one as opposed to the 4 I have.
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