How to factory resetMICROSOFT Lumia 640? How to wipe all data in MICROSOFT Lumia 640? How to bypass screen lock in MICROSOFT Lumia 640? How to restore defaults in MICROSOFT Lumia 640?
The following tutorial shows all method of master reset MICROSOFT Lumia 640. Check out how to accomplish hard reset by hardware keys and Windows Phone 8.1 settings. As a result your MICROSOFT Lumia 640 will be as new and your Snapdragon 400 core will run faster.
Start by turning off the phone.
Then press the Power Button once.
Afterwards press and hold the Volume Down button.
Release held key when you see the exclamation point.
Next, hold down the following sequence of buttons: Volume Up - > Volume Down-> Power - > Volume Down.