HARD RESET will reset your Microsoft Lumia 535 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. it will NOT UNLOCK the network lock. This method does not reset the PIN code of the SIM card. Warning! 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! if you can, make a backup before!