Remove Nokia Lumia 520 security code Hard Reset

Nokia Software,

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Remove Nokia Lumia 520 security code

1. press and hold the power key

2. phone vibrates (release the power key)

3. press and hold the V- key

4. exclamation mark is shown on he screen (release the V- key) 

Step 2

Input the key combination: 

1. V+

2. V-

3. Power

4. V- 

Step 3

 The phone will reset and boot up automatically.

Step 4

  Try, step-1,2,3 not ok Then Try Full Flash With ATF Box