Just got my N900 today and I thought the first thing I'd do was to upgrade to the latest firmware. Installed Software Updater on the PC and it's detected that the next firmware to update to is 1.2009.44.1. Do I have to jump to that one first before going to the latest one (2.2009.51.1)?

Also - where is the serial number on the N900? I tried so many different things in the Nokia registration website, but it kept saying invalid serial number.