Tivo Bolt XXX (software downgrade) error

Please help. I just got a refurbed Bolt directly from Tivo. My original Bolt had a video hardware problem. I took the upgraded 2TB HD out of my original Bolt and put it in the refurbed Bolt. On boot up, after a few minutes, it displays an error "XXX (software downgrade)" on a red background. It then says to call customer service. My original Tivo had been plugged in and working with the 2TB HD until just before I swapped it into the refurb Bolt. However, the original Tivo was deregistered by Tivo about a week ago, even before the refurbed Bolt shipped. How do I resolve this error
Thanks,
akhnaten