Quick feedback:
I have owned and used B2s for five years. I loaded everything up five years ago and incrementally add little. I back everything up to an external hard drive.
I love to use my Brennan as a personal Pandora and just play everything on random. It's amazing and almost always hugely pleasurable.
Because of that, early every January I delete all of the Christmas music off the Brennan B2 and leave it on the external hard drive. Early every December, I use the restore function and fully reload the hard drive onto the B2, restoring all the Christmas music. (Since it will matter in your interpretation, I don't know if I tried to use this function in Dec 2020 due to not being in this house last year for December for pandemic reasons).
This year, I tried to do that but the Restore function was gone. Before my first holiday party yesterday I didn't have time to figure out that JB7 was apparently a format even for early B2 music and that the restore function I needed was under a JB7-labeled submenu. I have never owned nor used a JB7. Anyway, my guests missed out on my full Xmas collection yesterday.
The silver lining is that I was reduced to playing the individual CDs singly thru the B2 and my kids were astoundingly rapt in attention to the Johnny Cash Christmas album's spoken word portions as it played while we prepped for the party. They were immunized to all other sound while that album was on, which was fun to observe.
Anyway, not sure what to suggest, but this is feedback that for the more casual user the JB7-label on those functions was far from intuitive.
Keith