If the 900E must be reset, all the settings will be cleared. An example of resetting the unit is if a password is set but unknown. There is no way to bypass the password. To reset the 900E:
1. Insert the key, turn it 1/4 turn to unlock and remove the top cover.
2. Locate the Reset Switch on the right side of the 900E, just above the ribbon and to the right of the settings diagram.
3. Using a pointed object, such as a pencil, press the Reset Switch.