Not a clue.
Not sure. Hook your Kobo up to your comp and poke around its .kobo directory - there's a configuration file there with the various addresses it connects to.
1.9.10 is the latest firmware for the Kobo Touch. No idea for the other Kobos. Not that it matters - if you use the desktop software, you'll get the latest firmware and you can just check your device information...
Should be all the same place.
Because no one's bothered to ask before, probably.