Hard Reset NOKIA Lumia 525
- Press Power button to switch off device.
- Then tap Power button + Volume down
- Release Buttons when device will vibrate.
- When you will see exclamation mark press this sequence of keys: Volume Up -> Volume Down -> Power button -> Volume Down
- Success! you can now work on device properly.
How To Hard Reset Nokia Lumia
Help! This doesn't work
Hard Reset will erase all of your data
All described operations you are doing at your own risk.