I received my new dvr and I can't get all of my channels - DirecTV

#1
I connected my new dvr and all of the channels are listed with HD beside them and I get a 771 message. I do not have a HD tv. I believe I might have accidently set it for this when setting it up. How do I fix it so I can get my channels?

This question, "I received my new dvr and I can't get all of my channels," is about DirecTV channels, programming, equipment, and sports.
 
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