If needed, this is from the link that was provided earlier in this thread - from the Roland doc:
Factory Reset
1. Press the [EDIT] button so it's lit. The display will indicate "EDIT"
2. Use the VALUE knob to select "SYS" and press the [ENTER] button.
3. Use the VALUE knob to select "SY16" and press the [ENTER] button.
4. "RST" will be blinking in the display; press the [ENTER] button.
5. "YES" will be blinking in the display; press the [ENTER] button.
Bob Bone