Method 1
Hard resetting Nokia Lumia 520 will:
* Erase all user data (contacts, music, messages, pictures, video, etc.)
* Erase all firmware settings
* Erase all applications installed by user
* Erase the content in internal storage
Reasons to hard reset Nokia Lumia 520 phone.
* Reset and disable forgotten screen lock password or pattern,
* Resolve hang-ups & freezing problems,
* Resolve slow performance of your Lumia 520 phone,
* Resolve unexpected Application crashes,
* Wipe personal data phone before you sell your phone or after you buy one,
* Regain default functionality of your Lumia 520.
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WARNING: Make sure to backup the data on your Lumia 520 phone before you proceed with a hard reset. NOTE: The data on your SIM card won’t be affected.
Steps to hard reset your Nokia Lumia 520:
1. Turn off your phone using Power key or remove and reinsert the battery.
2. Connect a charger or USB cable to the phone.
3. Wait for the charging process to start then hold and press Power + Volume down key.