Charter Cable Card Swap

We're about to upgrade from a Series3 to a Bolt+. Has anyone using Charter/Spectrum swapped out their cable cards from one unit to another without a service call?

I understand the Bolt+ uses a single cable card, not two like the Series3 (we also have a Premiere XL), so I'd only use one in the new Bolt+ and return the other.

I recall being able to do that when we had Verizon FiOS without any issues, but when we had Comcast, the cards were "assigned" to each TiVo box and required them to...

Charter Cable Card Swap

Charter Cable Card Swap