Well that was an interesting experience. Ended up taking about 3 1/2 hours. Two guys showed up, each in a different truck. Nothing was marked as DIRECTV except their shirts and the receivers. Everything else (including the trucks) had AT&T all over. After checking things out, one of the guys left. The other started with the install. He brought in an HR54 and a C61K. I told him that I didn't need the C61K because the new TV was a Samsung with 4K RVU built in, and that I was told the only reason it had been added to the order was because that was the only way the system would let them order an HR54 for me. They said the installer would be able to just setup the RVU and take the C61K off the order. He looked at me like a deer in headlights, said "Uhhhhhhhhhhhhh", and then said "We just started these 4K installs!" He then went outside, and when he came back in said that he had checked with "someone", and was told that he had to install the C61K. So I said "OK" because I just wanted this whole ordeal over with.
He then ran a new cable over to where the HR54 was going. Not sure why, as all the wiring was newly installed when I moved into my house 3 years ago - so wasn't old. He started installing the receivers, and then tells me that one of them was bad (I think it was the HR54) - and that the other guy who had left was on his way back with another one. Other guy shows up and they get the receivers setup, activated, and all that good stuff. Then they check the other TVs (I have 4 total), and the two they didn't touch weren't working any more. They called back into the tech line (I guess that's what it was?), and the first person they spoke with misunderstood and thought I was downsizing from 4 TVs to two TVs and had turned off ALL the old receivers. Got the two that had quit working reactivated, and all 4 TVs are working now.
It's amazing how good the picture is on this 4K TV - even on "regular" HD channels that aren't 4K. Really enjoying it so far! I spent the evening mounting the new TV on the wall, and hiding all the equipment behind the TV.
Only problem I've had so far is the HR54 has frozen up on me 3 times. It does see the AM21 and I can start to go through the setup, but when it gets to where it's downloading from the satellite (after I select my primary market) it freezes up. It's done it there twice - first at 66%, and then second time at 67%. It also froze up on me while I was attempting to set our recordings back up. I got several set up, and when I was about half way through our list of shows a "please wait" message came up in the lower right and it just stopped responding there. I let it sit for a while, and it finally went back to showing the channel I had been watching - but still with the "please wait" message in the corner, and I couldn't change the channel or anything else - couldn't even power it off. The only thing I've been able to do to get it going again when these freezes happen is press the red button on the side to restart the receiver. Have others had issues with the HR54 freezing? Haven't noticed any problems with the C61K so far.