1. Press the Power button and turn off your smartphone
2. Press and hold the Volume Up and Power buttons at the same time for a few seconds (up to 20)
3. Release the keys when the Boot Mode menu appears
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 smartphone screen, simultaneously press the Volume Up and Power keys
6. You are interested in the "wipe data / factory reset" item, the Volume Up / Down keys are used to navigate the menu, and the Power key is used to confirm the selection
7. Select "yes" from the menu items and confirm your selection by pressing Power
8. In the menu, go to "reboot system now"
9. Factory reset complete
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