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:welcome_s to DBSTalk, kevo58!

The only difference between the HR21's is the layout of the inside. Other than that the all function the same and have the same features.

As for going from the HR20 to an HR21 is not a upgrade or downgrade really.

The only differences between the two is the HR20's are silver and the HR21's are black. The HR20's have built in OTA tuners and the HR21's need an add on unit AM21 for OTA tuners. The HR21's have a 2nd ethernet connection that can be used to connect a 2nd device to your home network and the HR20's do not have it. Other than that the function the same and have all the same features.
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