Fire up your X3:
-> System setting -> Update lib
+ and - changes it from 'manual' to 'auto' (rescans library when you plug the X3 out of your computer)
press the 'OK' button to update manually. Then wait for it to finish.
If the screen goes off before ending the update, flick the hold switch to see if it's finished instead of pressing a button. This will break the update if it's still busy, at least that's what I read.