Somewhere I have heard you could recover it by SEUS. I do not know if it is true, but the person I spoke with told me that is is possible.

He told me that SonyEricsson tells you, when you use SEUS that the battery must be completely charged. Normally it will update your phone without a problem. But also your computer can fail, and then also is the datastream to your phone broken up. Then he told me that you can recover, by using SEUS again.

I know, flashing was probably not been done by SEUS, but with DaVinci or something like that. But, you can always try using SEUS.

Good luck! ;)