How to clear the NVRAM on a DIRECTV HD DVR

Turn to channel 1, wait till you have video and audio, then on the remote press:

Red, Red, Blue Blue, Yellow, Green

If this worked it would say: NVRAM Cleared or NVRAM Clearing.

I couldn't get this to work, but I turned it off waited 30 seconds and turn it back on and then it worked.

How do I get rid of all these extra channels in my DIRECTV guide

Menu -> Settings & Help -> Favorite Channel Lists -> Choose a List

Change Current Favorites to "Channels I Get"

You may have to go to Channels I get first and let it scan for which ones you receive.

You can also set up custom guides if you want from this menu screen also.

How do I had duplicate HD/SD channels in the DIRECTV menu

Press Menu -> Settings & Help -> Settings ->  Display -> Preferences

Change:  Guide HD Channels to "Hide SD Duplicates"

Now the guide will update it from showing both the HD and SD channels

Source:  Link