Hello! I have strange problem in my n900. When I go to settings -> information about product (not sure how it is called in english version) i see something like that:
(null)
(null)
Version: (null)
rest of informations are there, but not firmware version (MAC WLAN: [....] and so on)

The same problem is when I type "*#0000#". It shows:
V <n/a>
<n/a>, <n/a>
(C) Nokia

How can I repair this? Are updates avaliable for my phone if he have this issue?

I had done upgrading from pr 1.2 to 1.3 via xterm (apt-get upgrade) but nothing changes...

http://talk.maemo.org/showthread.php?t=46031 has ONE possible solution, search the forums for more:

http://talk.maemo.org/showthread.php?t=36912