- Turn off your onyx calypso
- Press and hold both Volume up and the Power button until it turns on.
- Scroll to 'Wipe data/ factory restore' (scroll with Volume Down)
- Confirm selection with the Power button
- Scroll to 'Yes---delete all user data'
- Again, confirm with the Power button
- Wait until you see Wiping complete
- Short press the Power button to 'Reboot now'.
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Answered: how to hard reset onyx calypso 9.7
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