@GoShark: Yup, the system one (which is usually the largest)
.
@pghaworth: That is... extreme. What does it look like over USB?
As for the downgrade, no one has tested, but from what I gathered, nope. It can't hurt to try, though
. It'd be good to check if anything can be recovered from the state you're currently in before that, though. (Again, logs would be neat too, because that's definitely new ^^).