My K800 is dead

[riders4sia]

Hi, I've unlocked my k800, but there is a problem, when I try to open the phone book the phone goes off with a white screen and then turns on by itself, which may be the problem? What can I do? Thanks

First, restore GDFS if you have backup, if still problem, full flash again

[Lelylu]

Hi, I'm not very expert, unfortunately I have no backup. Updating the phone can I fix this?