Nokia Lumia 520 Blue Screen Problem

1. Phone Switch Off

2. Press And Hold The Volume Down Button And Connect Charger (Or) The Usb Cable With Pc , For 

About 8 seconds, You Will See An Exclamation Mark( ! ) On The Screen.

3. Note: If You do not Press Any Of The Follwing Keys ,

Then Press The Keys In The Extract Order :

1. Volume Up

2. Volume Down

3. Power

4. Volume Down

The Phone will reset And Restart.