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Long press power key to switch off phone.
Now Hold together Volume Up and Power key for a while.
You can release held keys when you see an Android icon.
Then use Volume buttons to select “wipe data/factory reset” and tap the Power button to confirm.
Afterwards choose “yes” from the menu, and accept it with Power button.
When a Recovery Mode appears again on the screen accept option “reboot system now” using Power rocker.
Operation successful! Very Good!