After some severe and unexplained issues with my T-Mobile Dash I was able to find the hard reset procedure. The manual only lists using the start menu method. Of course that is fine if your device is working but if it isn’t then you can use this method to reset the device to factory default settings.
Master Reset:
With the device powered off, press and hold the 2 soft key buttons (buttons at the top on each side with the dash on them) and then press the power button once and then keep holding the 2 soft key buttons until you get prompt (Black screen with white text). Be sure and hold the two buttons for a second or two after the black screen appears or it will disappear again. Press the Green phone button (send) to start the reset procedure.
After the phone goes through a reset it will prompt you to press confirm to reboot the device and it should be clean at that point.
