Sure, you have to register the device. But after that is all over, just put the FW file that you want (from
https://www.mobileread.com/forums/sho...d.php?t=185660) in the .kobo dictory on your Kobo (hm, confirmation from somebody, is that the right directory? Suddenly I'm unsure) and you're golden. When you disconnect it from the pc, it will "update" to the FW version you want.