1. Check whether the phone is switched off.

    Hard Reset keys Nokia Lumia 820 and similar series

  2. Hold down the Power button.
  3. After the device vibrates, press and hold the Volume Down key.
  4. When you see an exclamation mark on the display, release both keys.
  5. Hold down the Volume Up key, the Volume Down key, the Power button, and the Volume Down key.
  6. Remember that this operation deletes all user data on your phone.

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