Is there anybody who can help me with setting portrait mode on nokia n900.

I thing i did everthing correct. i followed the instructions i found on internet,
and installed CSSU.
i did not get any error while installing.
but after reboot i thing it stills reboot in last nokia firmware.

i check the about product settings en it says
Version:21.2011.38-1
in the about community ssu it says
21.2011.38-1maemo1


but i still don't get portrait mode

what am i doing wrong ?
or what did i forgot to do ?

many regards
Nico Heiligers