Grandstream
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      Grandstream - How to Factory Reset

      1. Press MENU button to bring up the keypad configuration menu;
      2. Select "System" and enter;
      3. Select "Operations - Factory Reset";
      4. A warning window will pop out to make sure a reset is requested and confirmed;
      5. Press the "Yes" soft key to confirm and the phone will reboot. To cancel the Reset, press “No” soft key instead.