While updating to the new 4.5 OS, i think that i have bricked my phone. Now my BB wont connect to the desktop manager and displays an all white screen with a black horizontal line across it. Pressing the Alt and Shift keys will display their respective icon on the top right corner of the screen. Pressing the BB menu will display a small black dot on the bottom left corner of the screen. Nothing else comes up. Trackball moves the black horizontal line a few inches upa and down only. During the update, i think that my BB timed out and password locked itself. The DM displayed something like "the multi something was not able to proceed". Can anyone help? How do i restore to original OS?