http://www.hamforum.com/viewtopic.php?t=1223
Not specific to reflash, but does have info on programming ( setting up radio for programming )
I would suggest registering with the radio-info board, but Grog has had no luck, I'm not registered either, usually find the answer by searching the board, you can do that with-out the registration, try the Kenwood Commercial products forum.
Mark.