Help plzzz!!!!

hiii... i've got a serious problem with my w960i
while i was reinstalling the firmware using se update service, it interrupted. i don't know why it happened because the battery was fully charged. Since the firmware was not successfully installed, i decided to retry again. But i'm not getting the option to re-install, am getting only 1 option i.e to exit. When i turn on the phone there's only a white light and the sony ericsson logo doesn't appear.
I've seen all about xs++ and tried also but there's no progress at all... maybe am not using it properly...
Do i need to flash my phone???? Can anyone help me please?????????????????????