1. Press the Power button and turn off your smartphone
2. Press and hold the Volume Up and Power buttons simultaneously for a few seconds (up to 20)
3. When the Boot Mode menu appears, release all keys
4. In the menu, go to Recovery. The Volume up key can be used to navigate and the Volume Down key to confirm the selection
5. After the Android Robot logo appears on the screen, press the Volume Up and Power keys
6. In the menu, go to the line "wipe data / factory reset", the Volume Up / Down keys are used to navigate the menu, and the Power key to confirm the choice made
7. Select the line "yes" and press the Power button
8. In the menu, go to "reboot system now"
9. Factory reset done
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