Just picked up a Roamio OTA that hadn't connected to the mothership in two years (according to the network connections screen). When I first turned it on it came up to the TiVo Central (TE3) screen (still had old user stuff on it) but wouldn't respond to any remote commands (yellow light blinked but no response). Cycled power and then it worked fine. Went ahead and deleted current content and ran Guided Setup. Worked fine. Thought I would try to upgrade to TE4 because everything else I have is TE4 and I like the auto skip function. It went through the process but the download only took a couple of minutes instead of the expected "long time". When I went back to TiVo Central to try to do the recommended restart it stopped accepting remote commands again. Cycled power and it worked again but no update to TE4. Done this several times with the same results. Upgrading is not a necessity but I'm concerned about the symptoms. Maybe it needs an interim update before an upgrade can work since it was disconnected for two years? Current SW version is: 20.7.4.RC42-846-6-846.