hi, my  phone  did  the  same  thing  go  to  site,  www.sonyericsson.com/support,  and  follow the  instructions for  down  loading  the  software  for  the  phone,  you  will need  the  cable  that connects  your  phone to the  usb.  port  on  a  computer.  the  only  problem  is  that you  will  lose  the  pictures  on  your  phone  i did.  but  the phone  work  now. best  of  luck.
                 tony  parker.
                
 December 2008