1 - Hold the Volume key (-) to Low (1)
2 - Hold the SEND key (button to call) (2)
3 - Hold the POWER button (3)
4 - Hold the buttons until expression appears bootmode ...
5 - Wait until the warning appears (is a red triangle with a fulcrum of a Handheld).
6 - Hold the Menu button (4)
7 - Wait until the phone is restarted