I have a Kobo Arc 10HD and it runs on Android 4.2.2. I have successfully paired it with an Apple wireless keyboard but I still can't seem to use it. My virtual keyboard pops up and when I type on the Bluetooth keyboard nothing happens. Has anyone used a different keyboard that works? Is it even possible for me to use the Apple keyboard?
If you're sure the keyboard is properly paired, have you tried using the excellent External Keyboard Helper Pro? I use it with a Microsoft Bluetooth keyboard, and it handles both switching to the external keyboard from the internal one (and back) when needed, but also little chores like nuking the caps lock key.