Firmware v5.4 flash failed !!!!

Hi,
I tried to flash the firmware as indicated here
http://www.usbuirt.com/phpBB2/viewtopic.php?t=73
but the program UUFlash hanged at the last step
"Finalysing .."
It stayed frozen for 2hours, then I had to kill the process.
From now I cannot connect to the device anymore...
Why did it crashed, and how can I repair that ?
I'm running WinXP SP2
Thanks
Mat
I tried to flash the firmware as indicated here
http://www.usbuirt.com/phpBB2/viewtopic.php?t=73
but the program UUFlash hanged at the last step
"Finalysing .."
It stayed frozen for 2hours, then I had to kill the process.
From now I cannot connect to the device anymore...
Why did it crashed, and how can I repair that ?
I'm running WinXP SP2
Thanks
Mat