Regarding upgrade ::
just now i have updated the OS of my P990i.
its very simple.
Go to sony ericssons website http://www.sonyericsson.com/
Search for the software update service for P990i there.
Entire procedure is listed there ........
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search for usb drivers and if it still doesn't work you have to go to service with it ( they have "the magic box" - setools 3). if your phone works good JUST DON'T UPGRADE ! p990i has a very bad software even in the last version and they quited making new software for this phone.
I don't think that's possible as unlike the newer machines the 54x series has the OS embedded in ROM.
Even so, I own a 568 but notice that there are no plans to provide an upgrade to PPC 2003 so we'll both have to get Ipaqs :-(