@Cacofiend: Yes, given the timeline you mentioned, you probably jumped straight from a FW where UYK was usable to one where it's no longer as easy
. So, yeah, MRPI is the way to go.
@Antinoos: That's usually if your KUAL is down, you need the Booklet version, and you want to reinstall it. (Or if you really like search bar commands, I guess ;D).
In this case, the point is moot, because there's a bug which may prevent ;mrpi to work with certain bridge/MRPI combos (namely, old bridge, newish MRPI), and, given the timeline, it's quite probable that'd be the case here. (It works perfectly fine if everything's up to date).