Using the Touch firmware and just transferring the KoboRoot.tgz to .kobo folder, it didn't like it at all.
I have some books on sd card and it tells me the library is empty, even though when I go to the library it lists all the books and even loads the book I am reading to the right page.
It didn't go to sleep mode using the slider, and I had to reset. It then went to sleep mode, but wouldn't start again without another reset.
So it's back to factory reset, and 2.3.1 then