This is not my first TIVO rodeo. I have had TIVOs since way back in history (the early 21st century) when you could only record one channel at a time...
Well, the Bolt is faster than the Roamio and has 4K support, etc. If you have lifetime service on it, it's worth fixing. And it might be worth fixing...
The Roamios come with two-way RF remotes. Each remote will pair to one of the Roamios, and won't affect the programming on the other. You won't have...