QUOTE(jloi @ May 2 2010, 11:36 AM)
i try reinstall new firmware but somehow it keep pop out couldn't find my device

Not sure why it can't find your device? Are you using Windows 7?
Can you connect succesfully to PC Suite? If yes, try closing all other Nokia application, like PC Suite, OVI Suite, etc.
Then start Nokia Software Updater and re-try again. Not sure if it is because Windows 7 or not too.
Also make sure you charge your phone at least more than 50%. If the battery is low, it will not re-install.
Try to find out other reasons why it can't detect your N900, as I remember previously when you tried to update the Nokia Map, you also have problem detecting the N900 right?
If all else fail, below should work, but it's quite a complicated process especially if it's our first time:
http://thenokiaguide.com/2010/01/11/how-to...esets-all-data/
Added on May 2, 2010, 5:10 pmApparently there is PR1.2 firmware leaked (sort of), and few of the fellas at maemo-talk have flash it.
http://talk.maemo.org/showthread.php?t=51615&page=44This post has been edited by Andy214: May 2 2010, 05:14 PM