Hub reset and everything lost after firmware upgrade

I tried restoring to both an older firmware and an older backup (in various permutations). Nothing works. I am sometimes getting this message:

Corrupt database found

Hub cannot continue. Please try the following actions:

I tried rebooting, I tried powering off/on, I tried the soft reset (in the diagnostics menu) followed by a database restore. It always goes back to the Get Started page and nothing is there.

Maybe I am trying things in the wrong order, but even going back to an older firmware with an older backup did not seem to work either.