Upgrading the Flash by serial is no problem. It only takes a couple of minutes, and we don't have to do it very often.
I imagine it's designed like that because the StrongArm can inherently upgrade it's flash with serial, regardless of the Operating System, and could not load USB drivers(although the Chip has built-in USB support, I think), because the chip can't be running anything(ie. Linux) when the flash is upgraded.
Let me know, Empeg team, If I'm way off.
Jason

_~= Dearing =~_
"WAY too happy about having #99."
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_~= Dearing =~_
Gettin' back into it thanks to slimrio!