Microsoft Lumia 640 hard reset

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This method is called HARD RESET and will reset your Microsoft Lumia 640 to factory settings by using a keys combination without requiring the phone to be power on. Use it if you forget your security code or if you have various problems with the phone software.
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This method will not upgrade or downgrade the firmware version of your Microsoft Lumia 640 and it will NOT UNLOCK the network lock. This method does not reset the PIN code of the SIM card.
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Warning! You do this at your own risk! Take your sim card and memory card from the phone before the reset. All personal data from the phone (contacts, pictures, messages, apps, games, files) will be deleted! Please, if you can, make a backup before!
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