When i switch on the device after nokia logo appear and loading bar complete, The screen turns white and device restarts. I think there's not enough free space on flash memory.I need to re-flash it. Can anyone explain how to upgrade from IT OS 2006 latest version to OS 2007 Hacker Edition. When i use software update wizard, it checks version updates and always give 'up to date' message. I cant continue next level. I really need re-flash the memory. Please help..