When a PVR has been unplugged from cable, you have 30 days to watch the hard disk's content before the terminal locks itself, which allows you to bring your PVR on vacation and watch your recorded shows without the need for cable. But if the terminal has received it's deactivation signal before being unplugged, well, it's locked and there's nothing you can do.
So, perform the test with your "B" receiver: plug only the power and the HDMI/component cables to your TV, do NOT plug the cable in! If you don't see the "not authorized" after a minute, press the power button and you'll have access to its content. Otherwise, you'll need to activate it.
In TV world, november, february and may are ratings month, so a lot of shows have new episodes, so in order to move the hard disk from A to B, you better plan it.
CM-3020 with CM-7777