I dont know if the error is on the user end... I tried to flash my g6 to the new firmware, I got a white screen, and no x/30...
Did all the tricks in the book, (format fat 16 first, then use the low format utility...) If i get a progress, it nevers goes beyond 3/30, then the screen flash white. Now my gba section don't work and i can't even flash an older firmware on it. I tried flashing it with both my ds and Gba.
It think the problem resides in the flash rom for the g6 system. This thing don't get formated when you do a low format and you cant push an upgrade vie the usb loader, nor do you have an utility to revert the cart to factory setting...
I sent an e-mail tuesday (Still waiting for a response...) to g6 team, i'll wait and see what they have to say...