Hard reset Microsoft Lumia 640 LTE Dual SIM

OS: Microsoft Windows Phone 8.1, upgradable to Microsoft Windows 10

CPU: Quad-core 1.2 GHz Cortex-A7

Display: 5" inc

Camera: 8 MP, Single

For Hard reset Microsoft Lumia 640 LTE Dual SIM use following steps

1. Turn off the phone using the Power button.

2. Press the Power button and press and hold the Volume down button.

3. Release the keys held when you see an exclamation mark.

4. Press the following Volume Up -> Volume Down -> Power -> Volume down.

Thomas Nilan
Smartphone Expert

Thomas Nilan is a mobile phone expert with in-depth knowledge of the Android and iOS operating systems, who understands the settings of various hidden features that allow you to expand the capabilities of your smartphone, as well as get information about what is going on inside the phone for future repairs. He is an authority in his field, which has allowed him to become a ghostwriter for several technology publications, and he enjoys writing small mobile applications for testing smartphones.