When you turn on the device, open the "Settings". Then choose "Advanced settings". Here select "Language and input". Finally...
Use the emergency dialer to enter the proposed code: *983*22387#. Next choose "Erase everything" to confirm. Nicely done! The device data...
Go to "Settings" and then choose "Advanced settings". Now select "Backup&Reset". Next tap on "Factory data...
When you turn off the phone, hold down the Volume Up key and the Power button. Wait until the "Android" logo appears and then release...
Press the Power key to switch off your device. Hold down the Volume Up button and the Power key. When the "Android logo" appears,...
When you turned off the phone press and hold the Volume Up key and the Power button. Wait when the Android logo appears, release the keys. Next...