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 waiting for the Android Robot logo to appear on the smartphone screen and press the Volume Up and Power keys
6. Move the cursor to the "wipe data / factory reset" menu item, the Volume Up / Down keys are used to navigate the menu, and the Power key to confirm the choice made
7. Go to the "yes" menu item and confirm your selection by pressing the Power button
8. In the menu, go to "reboot system now"
9. Factory reset operation completed
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