Hard Reset of the T-Mobile G1

  1. Power off the G1
  2. Hold Home Key + End key for 20 seconds or until you see a "triangle with an exclamation point and a picture of the G1"
  3. Open the QWERTY keyboard and hit Alt+W
  4. Restored!

Soft Reset of the T-Mobile G1

  1. Power off the G1
  2. Hold Home Key + End key for 20 seconds or until you see a "triangle with an exclamation point and a picture of the G1"
  3. Press the home and back buttons