There is always a chance that bricking can occur during a firmware update, be it on Kies, Odin or otherwise. However, the chance is pretty slim unless your unlucky (eg. your computer crashes, power cut etc)
This is why I ALWAYS update on my laptop, which of course has a battery supply as well as power, so there is even less chance.
Try getting a USB Jig. It MAY work (but I THINK all they are good for is to reset the firmware counter back to 0/1 even tho the adverts state they can put a bricked phone into recovery mode)
Worth a go for