Simple answer, nothing if you can find the firmware for the phone, in fact s500 can be flashed to w580!
if you follow this procedure carefully http://forums.se-nse.net/index.php?showtopic=36780
firmware you will need is here http://www.iprotebe.cz/firmware-section2.html (free but need to register)
if you decide you want to make it a w580 just use w580 firmware instead of s500 :)
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