The real issue is that likely very few people have seen that unit to know what the settings look like.
Yeah, I know. The management UI is about what you'd expect from a consumer-grade device. It's pretty and functional, but very basic as to what it can do.
I don't see much hope other than starting over in a case like this. It's more or less the same as doing the infamous rm -rf / except far better because at least you can take a final backup and recover, file by file, anything specific that you need.