1. If the unit is on, switch it off.
2. Hold the "ENTER" key, while powering back on, and the following appears in the display: "D-TWO 1.06 Front 1.6"
3. Choose the menu item "Reset sys param ?"
4. Press "ENTER", and wait a few seconds. Now the display should read "Clear/reset done".
5. Power off the D-Two, and then back on. If the operation was successful, the display will read "> Kernel Cleared <"

Please note, that resetting the unit does NOT delete your user presets.