Bricked sony ericsson K800i

Hi everyone, I have a sony ericsson k800i. Once I flashed it since java apps and games had all disappeared, all went well. However next time I was updating the firmware from R1ED to RBF I accidentally unplugged the DCU cable and flashing failed. Since then I have tried almost every method of flash and repair; XS++, SeTool, FAR, Wotan, KK but all the time after flashing or repairing EROM the phone come on with a white screen then the usual homescreen, I use it for some few seconds then it goes white again and again and again. Someone please help!!!