I've been having the same trouble as azul above, so i updated the drive to the one that comes with setool lite as simox advised (you have to plug your phone in, then go to device manager, right click on the flash device and choose update driver software, then just choose the folder with the correct driver in.)

Now i'm trying to unbrick my k770 following a couple of encounters with that dirty blue screen, i'm using xs++ to restore the GDFS and it connects but then gets stuck at "activating gdfs...." and in the bar at the bottom i get "Sending Applet CSloader..." and then it's just frozen. I've left it for over 30mins, when in the past it only takes a couple of minutes to restore.

Also sometimes in the last hour or so the computer has been struggleing to detect the phone is connected- is this because my battery is low? I've tried plugging in the charger and the red light on the top left front corner of the phone lights up for a few seconds but then goes off again(anyone know what this is?) Does the phone even know how to charge itself when it's brickded? and why doesn't it just take power from the usb like most devices?

sorry have gone on quite a bit there.... getting pretty desparate now tho!..... please help!?!?!