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First, turn your device off. Remove sim card and MMC card (actually, you do not need to remove these, but after format remember to format memory card and reboot the phone). Press and hold 3 keys; Green dial key, * Star key, no. Turn your device on while you are pressing the three buttons. You should now see "Formatting .
3 key on keypad Together.  ." on the Screen! Leave the buttons now.