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. Press the Volume Up and Power keys at the same time when the Android Robot logotype appears on the screen
6. You must select the "wipe data / factory reset" item, the Volume Up / Down keys are used to navigate the menu, and the Power key to confirm the selection
7. Select "yes" and confirm by pressing the Power button
8. In the menu, go to "reboot system now"
9. Factory data reset completed
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