hi, my k800i stop working, if you go to site, www,sonyericsson.com/support you can down load the information that will put the software back on your phone, just follow the instructions, you will need the cable that connects your phone to the usb port on a computer, the only problem is that you could lose your information, i did with my picture's, but it's the only way of getting your phone to work again. best wishes for the new year.
tony parker.
December 2008