You must turn off the device .
Hold down the Volume Up key and the Power button.
Wait until the Recovery Mode appears and then release the keys.
Now, choose "wipe data/factory reset"...
Switch on your device.
Go to "Settings" and then tap on "Advanced settings".
Now, press "Backup&Reset".
Go for "Factory data reset".
Next, tap "Reset...
Switch to "Settings".
In Settings choose "About phone".
Next tap on "Build number" seven times.
Go back to "Settings" and activate Developer options.
Finally...
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