i was installing a OS in my brother phone using my laptop an then my laptop went dead when i turn on the phone i get a white screen with a fine black writing saying, app error 205 reset an every time i try to install the OS over it wont load the OS in the phone.... can some 1 help me!!!
__________________

Try a battery pull.

Using SEARCH would have shown you this: App Error 205 - Death of a BB

Plug the thing in next time.

BlackBerry® Desktop Manager will not display a connected status when the BlackBerry smartphone is in this state. Continue to run the application loader and do not select to option to back up and restore the BlackBerry smartphone data during the installation process.

This will perform a clean reload of the BlackBerry Device Software as an application level connection cannot be made.

Additional info

KB11320-How to perform a clean reload of the BlackBerry Device Software using BlackBerry Desktop Manager for Windows