I found it may be a defective device.. -__-
I go to -> Settings -> Display -> Brightness (always in grey)
I can't set the brightness level as the option is grey in color...
no matter I soft reset, power off and on a few times.. still the same.
Can't select the Brightness option in the display menu..
Attached the picture..
Edited by Squide, 26 March 2011 - 03:28 PM.