You should look at Mike Weasner's ETX site. There is a Mac application, called AutostarX, I think, that works for OSX to allow you to update the firmware. The best USB to serial cable connection people seem to recommend (in the Mac world, at least) is the one from KeySpan. Belkin has a particularly bad reputation. Weasner's ETX site will even explain how you can make your own serial cable (far beyond my capabilities, though).
I've not used any of these, BTW. I'm just passing on what I've read elsewhere.
Good luck.
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