Here is an official article from Palm which shows how the webOS updates work on Palm Pre : How do Palm webOS system updates work?
Random Palm Pre Stuff
May 27th 2009 | Posted by Deepak
Even though I try to cover & share as much news I can, there are still lots of things which get unanswered, so I thought to guide readers in right direction for some extra Palm Pre related info. Following guides and faq’s are from the 2 most popular tech blogs around the world. Gizmodo and [...]