Hey!! I got it working.. Here is what I did when I still can remember it clear.

I did connect Apple BT with Control panel - Bluetooth keyboard. It does find Apple BT keyboard then show you code and other settings.. Then it starts to connect..

I did enter code, (even it looks that nothing happends at N800 screen.. Just pairing-connecting at upcorner) and did press Enter at BT keyboard many times after entering code.. Suddenly it did just accept it and connect keyboard.

Now what I am thinking.. Maybe there should be window where enter code, but it just doesnt show it.. For some reason pressing enter many times after entering code with keyboard.. It did work..

Please someone who had problem pairing, try this.